A casual airplane ride.

Shido was not enjoying it.

A stormy boat ride.

Mario was not enjoying it.

What happened? Let's cut back to a few days ago.

"What do you think, Tamae?" Tohka's voice was a bit lower than usual. When looking at it closely, Tohka was not wearing a usual skirt, but rather trousers. "I... I am a man now! You can put me in the same room as Shido for the school trip!"

"T-that's not necessary, Yatogami..." Tamae was nervous. "Even if you wear those clothes, boys and girls must be in separate rooms."

A monotone voice spoke up. "I'd like you to approve this request." It was Origami.

"Eh?! What are you after?!"

"Nothing. However, to balance it out, we should make Shido into a girl."

Now Shido was just becoming irritated. He cleared his voice and then shouted. "Boys and girls will be in separate rooms! And no gender swapping!"

Tohka and Origami grumbled at each other. Tamae nervously spoke up. "Uh, well, putting rooms aside, you can choose your seats on the plane... Why not sit together there?"

They glared at each other. Shido sighed.

"The location changed?" Kotori was surprised. "Okinawa to Arubi Island, huh? Seems like the change was sudden."

A sleepy voice replied. "A travel agency said they would cover all costs in order to get publicity shots and presented these extraordinary conditions to the school."

"Sounds suspicious." Kotori thought to herself. "Wasn't the agency with DEM Industries?"

Mario was gawking at a giant boat that Fraxinus built. "Okie-dokie, what-a the heck?!"

Luigi just sighed. "Seems like they always go all-out on the mecha theme. I just hope this thing doesn't electrocute us."

"Huh?" Mario tilted his head. "You know who built it?"

"Yes." Luigi just rolled his eyes. "Fraxinus, Ratatoskr, whatever you call them... Kotori always goes all out for literally no reason."

"Well, who cares? It's a boat, and it's gonna get us to-a Arubi Island! I heard they-a might have new adventures waiting for-a us!"

"M-might?" Luigi peeked out from behind Mario. "That doesn't sound very assuring."

"We're the Mario Bros! We can-a take on anything!"

"Fair point." Luigi laughed. Mario then jumped onto the boat with his awesome parkour skills. He jumped on one plank and then did a wall jump. When he was on a higher plank, he did a backwards jump, leaping up into the air and landing on the main part of the boat. "Come on, Luigi!"

Instead of being a parkour master, Luigi just... waited for a plank to come down, then he walked on it, getting onto the main part. "A-alright." The plank retracted into the boat.

"Wait, who's driving?" Luigi looked at the wheel. Mario was immediately on it, as he went inside. "O-okay! I guess you got it, bro!"

"Oh yeah! Here we go!" Mario did a classic phrase as the boat set sail.

The sky was blue, there was an airplane heading for a different destination than Mario right now. It was the life, so to say.

"An airplane going to a croissant island?" Luigi perked up.

"Yeah, apparently that's-a Arubi Island?" Mario questioned.

"Oi..." Luigi was worried. There was sudden wind. REALLY heavy wind. "Where did this wind come from?"

Mario noticed the wind was circling around them. "A tornado?! This isn't Arizona!"

"Mario!" Luigi clinged onto Mario like the scaredy cat he is.

"Don't-a worry!" Mario shouted. The clouds were getting dark as a thunderstorm was brewing. "I'mma gonna try and get us out of this!"

"Easy for you to say!" Luigi shouted back while constantly steering the wheel along with Mario's help.

Mario gritted his teeth as the steering got really rouh.

"Okay, just keep-a going forward! We can beat-a this storm!"

"Right-e-o, Mario, you just keep on the lookout for-WOAH!" Luigi screamed as a deep impact hit the boat.

A sudden lightning strike hit the boat and lost a major chunk.

"Mama-mia! We lost the b-" A lightning strike then hit Mario himself. He got launched off the boat.

"MARIO!" Luigi screamed in terror.

Mario's unconscious body could only hear waves crashing on a shore... Footsteps approached him.

"You think he's dead?" He heard his brother worriedly say. Oh, Luigi, I'm fine, don't worry... Is all Mario wanted to say, but he didn't have the energy to move his mouth.

"Kzz-Lui-you're... breaking... up..." There was an annoying voice. Guarantee with 100% certainty that Kotori's gonna be mostly out of the picture here. Great.

"Kotori?! Hello?! Hello?! Oh, mama-mia, I don't-a have any 1-Ups on me... um..."

Mario's eyes widened. He couldn't bear to see his brother troubled like this! And Kotori was just gonna leave him high and dry?! He instantly got up. "Hey, that's-a my b-" And then Mario froze in his tracks when he saw who he was scolding.

Right. It was just Luigi. The green man just smiled. "U-um... thanks for caring about me, Mario, but could you not jump up so quickly?! You're gonna give me a fright..." Luigi grumbled.

"I'm-a sorry, bro, I just can't-a handle her sometimes..." Mario grumbled.

The duo grumbled until they felt another wind storm coming. This time it was more like a hurricane. Mario looked up at the sky as it was turning cloudy once again. "Mama-mia! Are we in-a Florida now?!"

Luigi pointed to an airport. "Quick! We'll take cover in there and THEN settle what's going on!" The duo ran ahead with Luigi trailing behind.

They rushed inside the airport and slammed the door when they all got in.

"Bad weather or what?" Luigi asked to hopefully lighten the mood.

"Yeah." Mario wiped sweat off his forehead and gathered his breath back. He then looked up and held his breath again.

There was all the Raizen High Students in the building, looking at the two plumbers.

The three gossipers (you know them well) stepped forward.

"Ohmigod, what is that?!" Ai spoke.

"Ew, they have really big noses!" Then Mai.

Luigi covered his nose. "Hey, we're proud of them, plus our mustaches are under them..."

"That's so lame..." And finally, Mii.

Tamae stepped up. "Wh-what is the meaning of this...?"

Mario stepped up too. "We're-a associates of-a Shido Itsuka."

"Shido Itsuka?" both Tamae and Origami replied, with the latter lowering her eyebrows. Origami has a grudge on Mario too.

"Yeah..." Luigi spoke up. "Any idea where he is?"

Tamae panicked. "Now that you think about it... No, I haven't!"

Luigi was quick to look outside now, and noticed brighter weather. "Good news. The hurricane stopped."

"That was-a quick." Mario looked out and saw four silhouettes. He noticed one of them had blue hair. "Is that-a Shido now?"

Origami, Tamae, Mario and Luigi rushed out onto the now sun-lit airport road. What Origami scanned was two of the figures having orange hair and they were sandwiching Shido. The fourth figure was an unconscious Tohka on Shido's back.

"H-hey..." Shido twitched. "We're back..." He then turned his head to the two plumbers. "Wha?! Mario?! Luigi?! I thought you were back in Tenguu City!"

"We were," Mario sighed "We were-a gonna arrive-a here earlier, but our-a ship crash landed here due to a tornado!"

"A tornado?!" One of the orange-haired figures gasped. "Way to commit, Yuzuru!"

"Doubt: That tornado was definitely your doing, Kaguya." The other orange-haired figure.

"Wait a minute." Mario put two and two together. "Kaguya! Yuzuru! What the heck?!"

Then THEY put two and two together and looked at Mario. Kaguya spoke first. "Mario! Been a while! What a coincidence we keep running into each other! Maybe this is fate's dark doing?" She did a cool pose.

Shido seemed to sigh of relief when he heard that news. "Ah. For a minute, I thought I'd be completely left on my own here..."

"So..." Mario sighed, twitched his eyebrows and turned back to the twins. "So what-a are you two doing with-a Shido?"

Kaguya spoke first. "Well, isn't it obvious? It's obvious to ME that I'm more charming than Yuzuru, Shido!"

Yuzuru spoke back. "Seduction: Please choose me." The twins were right up into Shido's face.

Everyone just eyed the three. Mario finally spoke the one question that everyone had in their mind.

"What gives?"

Shido was sweating bullets.

And the answer given by Reine was... "They are transfer students."

Tamae was with Reine. "Those two girls? But I didn't hear anything from the school..."

"It was sudden, so they probably couldn't contact you in time." Reine was lying about them being Spirits, but she couldn't afford to let Tamae know. "Please leave the girls to me. You can take care of the students, Okamine."

"Okay..." Tamae just watched as Reine entered a door.

Behind that door, the two orange-haired twins were still surrounding Shido. "Now Shido, all you have to do is simple..." Kaguya was clinging onto him. "Just say 'Oh Kaguya, you drive me wild! Let me offer myself to you, body and soul!'"

"Negative: Nothing good will come of choosing Kaguya." Yuzuru retorted. "Please feel free to vote for me."

Shido's eyebrows were rapidly twitching during all of this. Reine was in front of Shido and finally said. "Feeling a little smothered, are we?"

"Yeah."

"So." Mario folded his arms. "What are they-a doing?"

"From what I heard..." Luigi recollected. "It's their 100th duel! Attractiveness contest."

"100th Duel.." Mario definitely heard that come from the twins before.

"Why is the number 100 so important to them?" Luigi complained.

"It's-a their final duel."

"Now, Shido, just say it." Kaguya got closer "Who do you think has more feminine charm? Yuzuru or me?"

Yuzuru also got closer. "Question: Who is cuter? Poor Kaguya or me?"

"What's the deal with only kind of speaking ill to me?"

"Ignore: I am cuter than pitiful Kaguya."

"What are you doing, making it worse?!"

Shido finally cracked and yelled. "Would you two shut up for one second?!" He took a breath and looked at them. "Let me ask you something first, why are you guys dueling anyway?"

Kaguya looked confused. "Oh, we didn't tell you?"

"Forgetful: We forgot to tell you. As the judge, you have the right to know." Yuzuru then started. "Kaguya and I were once a single Spirit."

"The Spirit's name was Yamai."

Meanwhile, a very similar scenario was happening on the TV back at the Itsuka Residence. Yoshino was watching a cheap soap drama.

"Pick me!"

"No, pick me!"

Yoshino yawned. Didn't have much to do today, but even this was boring.

Shido was processing all the information. "So basically, for reasons not important at the moment... you two will one day need to go back to being a single Spirit. But when that happens, the personalities of both Kaguya and Yuzuru cannot coexist."

"Indeed. The original personality of Yamai has long been lost." Kaguya confirmed. "Either Yuzuru or I-only one of us-will become the new Yamai."

Yuzuru continued. "Explanation: In order to determine who that will be, we have fought for many years.
Fistfight,
Footrace,
Kendama,
Eating Contest.
We have competed in various ways."

"Those last two were way less intense." Shido furrowed his eyebrows. "What happens to the personality that loses?"

"It will cease to exist." Kaguya got cold.

Shido gasped and turned to Kaguya. "No way!"

Kaguya just clinged closer to Shido. "We're grateful to you, Shido. Because of you, we can compete in a way such we have never before."

Yuzuru also got closer. "Affirmative: I have no objections if the final decision is made through this match."

Shido was struggling, and Reine was no help. All she did was look at her tablet. "Not good."

"Is something the matter?" Shido spoke up to Reine.

"Yes. I have not recieved any communications from Fraxinus in hours."

Shido gulped some sweat.

"The reason is unclear. I will look into it." She then looked at the Yamai twins. "Now, ladies, if you could, please come with me? Shin is tough to break. I will show you how to deal with him."

"Great." Shido was talking to himself as he made his way down a walkpath of Arubi Island, heading towards the hot springs. "Two new Spirits show up and Reine and I have to fly solo. What is Reine even telling them anyway?" He was walking down the path when he saw two short men going up the path, the red and green duo of Mario and Luigi.

"Ah, Mario, green guy, what's going on?" Shido tilted his head and questioned.

"Getting used to-a this island, that's-a what. It feels weird not having-a futuristic buildings everywhere..." Mario complained.

"Where are you going?" Luigi asked.

"Ah, to the hot springs. I need a break."

"Ah." Luigi got the idea. "Well, we'll see you-"

"Oh, speaking of breaks from annoying things, any of you have any idea about Kotori?"

"Nadda." Luigi confirmed. "Last thing she said was my signal was breaking and that it's finnicky..."

"Finnicky?" Shido questioned.

"Yeah, like a deliberate signal jam."

"Wonder what that's-a all about." Mario pondered.

Shido looked down that path. "Ah, gotta go! Bye!" He sped off.

"Man, Shido.." Mario rubbed his own head. "Let's-a-go." He ran back to the airport which Luigi quickly sped along.

Meanwhile, Shido caught up to the Yamai. "Ah, you guys." He saw them standing in front of the hot springs.

Kaguya folded her arms. "Shido, I grant you permission to cleanse the impurities of everlasting darkness you have accumilated."

Yuzuru was also folding her arms, but not as boldly. "Translation: Please enter the bath."

Shido looked at the place with a blue sign labelled 'Men' with a door behind the sign.

"But why tho?"

Oh. That's why. Shido was currently in the bath with Kaguya and Yuzuru surrounding him.

"Wait... Why are you two in the male's bath too?!"

Kaguya grinned. "How's that? Even you have no choice but to bow down before my feminine charms!"

Yuzuru rebutted. As usual. "Scorn: Feminine charms, LOL." Yuzuru really just said LOL in person and not texting. "This is the first I've heard of you being endowed with such things."

"Ha! You'll pay for that later!"

"Challenge accepted. Just what I was hoping for."

Shido yelled out again. "Um, EXCUSE ME!" The twins were taken aback by his sudden outburst. "This is the men's bath! So that means neither of you are supposed to be here!"

Kaguya grinned and got closer to his ear. "You better prepare yourself, Shido. I'll make you unable to be satisfied by anyone but me."

Yuzuru also got closer. "Negative: Just think. There is only a flimsy white towel separating our flesh."

They then reached their hands down... somewhere. Shido gulped and gasped. "Joystick... came on!" He whimpered.

...

...

...

Just when he thought he was doomed, he snapped back to reality. "...huh?" He just looked around to see Kaguya and Yuzuru staring at each other.

Kaguya smirked. "Out of the kindness of my heart, I will allow you to seduce Shido first, Yuzuru."

"Negative: It is unnecessary. You are the one who needs a handicap."

"Y-you fool! The moment I make my move, Shido's eyes will never leave me! I just thought I'd give you a chance to appear-"

"Skeptical: Truth is, you don't know what to do, do you?"

"Of course I do! I'm super hawt and sexy!" Kaguya and Yuzuru were bickering while Shido was just... sitting there in the middle. "And I've got a ton of adult techniques you can't even think of!"

"Suspicious: Then please, show us." Yuzuru had a smug face.

"Fine, just you watch!" Kaguya then stood up and did a model pose. Well, her child-like figure did not really help in that manner. If anything, Yuzuru would be better-looking in that pose.

Speaking of Yuzuru, she was just giggling. "Heh, snicker snicker, hehe, hehe."

"Um..." Shido looked back at Yuzuru.

Kaguya instantly ducked down again. "What are you two on about?!"

"Scorn: As expected, Kaguya's feminine charms, LOL, are something else."

"What did you say?! You don't know what to do either, do you?!"

Yuzuru twitched her eyebrows, which were downward. "Negative: Such a thing is not possible." She pointed at Kaguya.

"Then why don't you give it a try?!"

"Acknowledged: Fine." She just waded over to Shido. "Bewitching: Kiss!" She kissed the air with her hands like a princess.

"Uh. Yeah." Shido was not amused by it.

Kaguya did a really loud laugh. "Kyahahahahah! What was that? WHAT was that?! Was that supposed to bewitch him?!"

"Indignat: I do not want to hear that from you."

"Hmph! Same here!"

"Negative: Your childish figure is nowhere near seductive."

"You're not that different yourself!"

"Rebuttal: They do feel different."

"You do not seem to know the attractiveness of a slender body!"

"Scorn: Slender body, LOL. Even if you change the words to make it sound better, the truth doesn't change."

"Hah. Such a thing is just a mass of fat, after all."

"Offended: That is inexcusable. Is that your jealousy, Kaguya?"

"Who's jealous? I'm not jealous at all! Shido thinks I'm cuter than a fatty like you anyway!"

"Negative: When appealing to men, it is a crime to be flat chested. No one would take a second look to chicken bones like you."

"Who are you calling chicken bones?!"

"Return attack: Who are you calling fatty?"

"You have more split ends than I do!"

"Point: You are slightly smellier than I am when you sweat."

"You have more body fat than I do!"

"Pity: I feel bad that is the only thing you can comment on."

"Shut up, puffy puffball!"

Meanwhile, Shido was just sweating all around. He needed to find a way out. He then saw some silhouettes at the bathroom door. "Uh-guys."

Yuzuru made one last comeback. "Counterattack: Flat-as-a-board flat."

"Others are about to come in!" Shido finally spoke up. "Won't it be bad if you were found in the men's bath?!"

Kaguya and Yuzuru just looked down upon Shido. "Hah, what are you talking about, Shido?"

"Negative: No need to worry."

"But.."

The door opened and a girl in night-coloured hair jumped into the hot springs. Finishing her glutton meal early, because of course she always did, it was Tohka. She jumped into the pool without even seeing Shido. "Yay!" She stood upright. "First one in the bath!" She then noticed the situation. "Huh?" She looked up. Kaguya and Yuzuru staring at her with blank expressions, and Shido just... fearing for his life. Nobody said anything for a moment.

...

...

...

Then they both let out a scream. "aaaaaAAAAAAAAAAAAAAAAAAAAAH!"

Tohka instantly covered herself up. "Why are you in a place like this, Shido?!"

"No no no!" Shido retorted. "Why are you in the men's bath?!"

"What are you on about?! I went to the red sign door like everyone told me to!" The red sign meaning 'Women'.

"...huh?!" That was news to Shido. He definitely went in the door with the BLUE sign. He looked at Kaguya and Yuzuru. "Don't tell me you guys-?!"

Kaguya confirmed. "Yep. We changed the signs before you came in, Shido."

Yuzuru continued. "Supplement: After you came in, we put them back."

"There's no way we would enter the men's bath."

Shido just took a big sigh after realising he fell into a trap.

Tohka also sighed. "I came here early to be first in the bath but now I'm the fourth..."

Shido looked behind himself for an escape route. "Anyway, I was tricked! I'll get out right now!" As Shido stood up, even more girls entered the bath.

"Wow, what's this? It's amazing!"

"So spacious! The ocean's so close!"

"That's so lame!"

Of course, the three gossipers Ai, Mai, and Mii walked in. A fourth person was with them with short white hair and doll-like features, of course it would be Origami.

Shido fastened his towel around his waist. "Crap, what should I do...?"

"Shido." Shido turned to Tohka. "I'll be your shield, so hide behind me and run away!"

"Tohka...!"

"It's not your fault, right? In that case, Hurry!" Finally, Tohka is one of the only people who UNDERSTAND that it was an accident.

Shido froze while he took it all in. "Thank you. I owe you one." He bowed his head.

Tohka then imitated a mime while Shido was behind her. This gathered the trio's attention.

"Oh, I see Tohka!"

"What are you doing all the way over to the side?"

"That's so lame..."

They approached Tohka, which sent her into a wild panic, flailing her arms all around.

The three just kept walking towards her. "Huh? Is something wrong?"

"Uh, no! It's nothing!" Tohka was still panicking. Shido was getting irritated. Tohka then blindly pointed to the sky. "LOOK OVER THERE! There's a giant kinako bread in the sky!"

While they were distracted, Shido made a DASH to the exit. However, the only exit was down a 10 foot drop to the ocean.

While Tohka was backing up while still pointing, she bumped into Shido. He wobbled and tumbled, and eventually lost his balance. He fell right into the ocean.

Meanwhile, Reine was computering on her laptop. (confused yet?) She stopped when she heard light knocking. She turned her head in question and saw the door open, revealing a shirtless shivering Shido. The two just stared at each other before Reine made a comment.

"Isn't it a little early to sneak into a woman's bedroom?"

"We've had a wrench in the plans." A blonde woman (yes another female, sick of it yet?) was communicating to someone. This woman had long creamish blonde hair. Ellen, assistant of Isaac, was on the island. "But the plan will be carried out tonight. Please have Bandersnatch on standby." She looked at the photographs to see Tohka and Mario in a selfie together. Rabbid Peach would've been jealous, if she were still in this world. Ellen's static expression turned into a sinister smile.

"...Strange energy?" Luigi was talking to Mario on his walk through the island.

"Yeah, I got that-a gut feeling! Like what I normally have!."

"...Mario, that might just-a be you hungry! And you're-a always hungry!"

"So what do you-a say?" Mario ignored Luigi. "Do you really not-a trust my gut instinct even though it-a saved us many a times?"

"...Fine." The two bad plumbers replied and caved in.

Yoshino was getting sleepy from watching her drama.

"Yoshino..." Her puppet, Yoshinon, spoke.

"What is it?"

"We sure got a lot of free time during this school trip, huh?"

Yoshino just silently nodded.