In Chaldea, there are three servants that are well-known for being the pranksters of the place.

Merlin, Irisviel, and Da Vinci if she wants to.

In Merlin's case, everyone in Chaldea is practically a target to his shenanigans.

In Irisviel's case, her family is the target for her shenanigans.

And in Da Vinci's case, both Shirou and Ritsuka are the target for her shenanigans.

Normally, they just mind their own business and don't interact with each other's shenanigans. However, when those three joins together...

May the root have mercy on Chaldea...especially for the victim or victims of the combined prank from them...

"So, Da Vinci, why did you ask me and this lovely lady over here to come to your workshop?" Merlin asked.

"Merlin, I know that you are part incubus and all, but don't try to seduce me! I'm already taken by my husband of course!" Irisviel said cheerfully. "Anyways, why did you ask me to come here Da Vinci?"

Da Vinci let out a smirk. "Before I give all of you the answer, let me ask all of you a question. Do you mind?"

"No. I don't mind," Merlin said.

"So do I," Irisviel said.

Da Vinci's smirk grew even further. "Do all of you remember that Japanese comedy show that appeared on Chaldea TV lately and how I've been starting to watch it?"

For a moment, all of them were wondering what Da Vinci was talking about until Merlin realized what Da Vinci was talking about. "Ah. You mean Gaki-No Tsukai, right?"

"Yes. That show," Da Vinci said.

"I've heard about that show and seen a few segments from it. But why are you asking us about it?" Irisviel asked.

"Well, you ever heard of the haunted building segment that they do once a year?"

Irisviel nodded in reply. "Yeah. I've heard of it. But why though?"

"Well...how would all of you like to live through that experience?"

At that moment, Merlin and Irisviel immediately knew what she was talking about and gave her their replies.

"Oi oi. Sorry, but that's not my thing. I prefer to be the prankster, thank you," Merlin replied.

"Me too. It's more fun to pull shenanigans," Irisviel replied.

"That's not what I meant. I'm asking you if you want to watch with me the scare the person I have in mind in the haunted room I'm creating."

"Ho? And who is this person you have in mind for scaring?"

Da Vinci smirked again. "Isn't it obvious? Shirou and Ritsuka of course!"

For a moment, both Merlin and Irisviel were confused with Da Vinci's answer. "Shirou and master?" they said in unison.

"Yes!"

"Why though? Why do you want to put my son and his master into a haunted room of your creation?" Irisviel asked.

Da Vinci let out a sigh. "BECAUSE I'M BORED! THAT'S WHAT!" she exclaimed.

Merlin and Da Vinci was speechless from Da Vinci's uncharacteristic outburst. "Eh?" they said in unison.

"You heard me! I'm bored! Recently, it felt like every day is the same day! Every day, Ritsuka just wakes up, eats breakfast, does paperwork, then has lunch, then does training, then eats dinner, then hits the showers, and then he goes to bed! And he's been at it for quite a while! And it's the same with Shirou too! I swear, I wish something would happen right now!" Da Vinci ranted.

"Wow...she's this bored..." Merlin and Irisviel thought in unison.

Da Vinci then calmed herself from her earlier outburst and cleared her throat. "Anyways, I want to make a haunted room like the ones in that comedy show. And I want to place those two in that room."

"I see...so you want us to put Shirou and master into a haunted room just so you can see their reactions to the traps we set up?" Merlin asked as he was started to put the pieces together.

"Yeah. What do you think?"

For a moment, Merlin was silent for before turning to Irisviel. "What do you think?" he whispered to Irisviel.

"Well...that idea doesn't sound bad. I do want to see the reaction of Shirou when he's in a haunted room. And that idea does excite me a bit," Irisviel whispered back to Merlin.

"I think so as well. It may be old fashioned, but it is also hilarious as well," Merlin whispered to Irisviel.

Soon, both Merlin and Irisviel stopped whispering between each other and then turned to Da Vinci. "Well?" Da Vinci asked.

"This idea...we're in on it," Merlin said.

Da Vinci let out a huge smile. "Great! Let's begin now!"

And thus, the three pranksters began their craziest and most dangerous plan of them all...

"Ugh...what the heck?" Shirou thought as he was waking up from his sudden nap. As he was waking up, he saw that he was not alone. Within the room he was in, he saw Ritsuka, who was on the ground as well. "Master? He's here too? Well, I've got to wake him up." Shirou then went over to where Ritsuka was and nudged him on the shoulder. "Master. Master. Wake up."

After a few seconds of nudging, Ritsuka finally heard Shirou's words and woke up. "Hmm...Shirou?" he muttered.

Shirou let out a sigh of relief as he saw Ritsuka waking up. "Master, are you all right?" he asked.

"Mmmgh...yeah. I think so. I'm just a little tired. That's all," Ritsuka replied as he was rubbing his eyes and yawned. "Anyways, where are we?" he asked as he looked at the room he and Shirou were in. Right now, Shirou and Ritsuka were in a high school classroom that looks abandoned. There were desks and chairs in corners of the room, few of the windows were broken, a lot of stuff were spread out, and there was a green board in front of them.

"Honestly, I have no clue. However, the room that we seem to be in now looks like an abandoned high school classroom," Shirou replied.

"Yeah. And I think I have a hunch on who put us here."

For a moment, Shirou immediately knew who Ritsuka was talking about. "Merlin's behind this again..." he thought as he let out a sigh. "Anyways. Let's get out of this room for now."

"Agreed. Shirou, can you project a flashlight?"

"Sure." Shirou then projected two flashlights for him and Ritsuka to use. They then headed towards the classroom door. As they did, they tried to open the door, but the door was locked. "Well, the door seems locked. Should I cut the door down master?"

"Yeah."

"All right. Stand back for a moment." Shirou then unsheathed his katana and sliced the door into half. "All right. Let's go now," he said as he proceeded to exit the room.

However, before he could, it was then that he felt sudden burst of cold white smoke blasting him in his face from all sides. "What the?!"

"What the heck?! Shirou!" Ritsuka yelled.

Soon the white smoke cleared, leaving Shirou unharmed. "What the heck?! White smoke?! Where did that come from?!" Shirou then checked his surroundings and noticed that on the ceiling exactly where he was were exhaust ports that blew out air, and he was right under them. "So that's where the white smoke came from..."

"Shirou! Are you all right?!" Ritsuka asked.

"Yeah. I'm fine master. Although it looks like we might want to be careful if we're going to escape from here."

"Seems so."

And then, Shirou and Ritsuka went into the abandoned hallway...

(Meanwhile...)

"Aw. Shirou just had to make things easy and boring for us by cutting down the door. And to think that I placed the key to the door somewhere in the room..." Irisviel said with a pout on her face.

"Yes. And he just had to enter one of those traps as well first...with no reaction in the end!" Merlin said.

Da Vinci let out a sigh. "Well, this is Shirou we're talking about here. It's going to take more than that to scare him."

"True..." Merlin and Irisviel said in unison.

(Back to where Shirou and Ritsuka was...)

"Shirou, is it me, or does this remind you of something?" Ritsuka asked.

"Honestly, this feels like a haunted house. Or in this case, a haunted high school," Shirou replied as they were walking down a hallway, using their traced flashlights to see where they were going along with anything that stood out. As they were walking, they came across a stop sign that had the words, "Go right," plastered on it.

"Go right...should we go right?" Ritsuka asked.

Shirou looked left for a moment and saw that there was nothing on the left. "Guess we have to," he said. He and Ritsuka then turned right and headed down the hallway the sign was pointing at. As Shirou and Ritsuka continued walking, they reached another wall.

And in front of them was a table, with two boxes with each of their names.

"Shirou. Are you seeing what I am seeing?"

"Yeah. Looks like there's two boxes; each with our names on them."

Shirou and Ritsuka then headed towards their respective boxes and opened them up. As they did, they looked inside what was in it and saw a note in them. They then picked it up and read them; each of them having a different answer for both.

Shirou's note said, "Go to the room on the left if you want to escape." Ritsuka's note said, "Go to the room on the right if you want to escape."

"My note said go to the room on the left if you want to escape. What about yours master?"

"Mine said go to the room on the right if you want to escape."

"I see. What should we do master?"

For a moment, Ritsuka thought about the situation he and Shirou were in. After a few seconds of thinking, he had a conclusion. "All right. For now, we should go to the rooms we were assigned to, and if things get bad on my end, I'll summon you by a command seal."

"All right. Good luck master."

"Yeah. You too Shirou."

And Shirou and Ritsuka went to the rooms they were assigned to. As Ritsuka went to the room on the right, he looked at the room he was in. Like the room he was in before with Shirou, it was a complete mess. Only this time, the room was a science lab instead of a normal classroom. Ritsuka then walked around the room, looking to see if there was something that caught his eye.

"Hm...nothing seems to be wrong with this room..." he thought as he stood still for a moment to examine his surroundings.

It was then that he felt something touching him. For a moment, he shrugged it off, thinking that it was just a fly. However, the feeling kept coming back, and then Ritsuka turned around to see what was touching him.

And behind him...was a skeleton moving its hand.

"GGGGYYYYYAAAAAHHHHHHHH!" Ritsuka yelled.

(Meanwhile...)

"HAHAHAHAHAHAHAHA! Yes! Master fell for it! He fell for the old haunted skeleton prank! And the reaction was worth it!" Merlin said while laughing hysterically and rolling on the floor.

"Indeed! And the way he screamed...it sounds hilarious! Da Vinci replied as she was laughing as well.

"Wow...so that's master's scream..." Irisviel said as she was giggling a bit.

For a few seconds, all three of them were stuck laughing at the scream Ritsuka emitted. After they had their fill of laughter, they eventually calmed themselves down and took deep breaths. "All right, let's see what's Shirou's reaction to the haunted skeleton prank..." Merlin said as he turned to the camera view of the room Shirou was in. Merlin then pressed a button that activated the skeleton. "All right, now let's see what Shirou's reaction is..."

All three of them waited as the skeleton came up behind Shirou. As the skeleton touched him, Shirou turned to see the skeleton touching him. However, to their disappointment, Shirou didn't let out a scream or anything.

Instead, he just slashed it down like what he did to the door earlier.

"Dang it...just like last time. Is there anything that can faze him?" Da Vinci asked.

"Well...there is one thing that might work..." Da Vinci said.

Merlin and Irisviel then turned to Da Vinci. "And what would that be?" Irisviel asked.

Da Vinci let out a smirk. "Oh, you'll see..."

"Master, are you okay?" Shirou asked as he was comforting Ritsuka from his scream earlier.

"Yeah...I think I'll be fine..." Ritsuka muttered as he was gathering breath. "Still though...I did not expect that."

"Me neither. Anyways, let's continue. I think we're getting closer to the exit."

"I hope so..."

Soon, Shirou and Ritsuka began heading towards the exit of the scenario they were in. As they were getting there, they would end up seeing cheesy traps or gimmicks that would jump scare Ritsuka at first, but he got used to them over time. Meanwhile, Da Vinci, Merlin, and Irisviel let out sighs after seeing Shirou being unfazed by the traps.

Eventually, Shirou and Ritsuka finally reached the exit.

"Well, we're finally here," Ritsuka said.

"Yeah. All we need to do is just to exit through the door and we'll be out of here," Shirou said.

However, before they could do so, they heard a voice that Shirou thought he would never hear again.

And it was then that voice said two words that nearly made him go mad.

"Rejoice, young boy."

On instinct, Shirou quickly turned around while unsheathing his Muramasa blade, hoping to strike down the person or thing that said that voice. However, nothing came.

"Shirou? Is there something wrong?" Ritsuka asked, surprised to see a reaction from him like this.

"Sorry master. That voice you heard...it's a voice I do not want to hear ever again," Shirou replied.

Knowing that the voice touched one of his nerves, Ritsuka quickly changed the topic. "Anyways, let's get out of here."

"Agreed."

And the two headed towards the exit. As they did, they were encased in a bright light.

"Mngh..." Shirou mumbled as he was waking up. As he did, he realized that he was on a bed and on his head was a set of VR equipment. "So, what we saw was a Virtual Simulation...that would explain the entire scenario we were in..." he thought as he took off the VR headset. He looked around and saw that Ritsuka was in the same situation he was.

Shirou let out a sigh. "Just who's idea was it to include that voice there? Even now, it still creeps me out...and I don't want to hear it ever again."

(Meanwhile...)

Merlin and Irisviel were shocked at what just happened. After all, they just made Shirou lose his cool for a moment, and it was because of that voice.

"Uh...Da Vinci, where did you get that voice?" Merlin asked.

"The internet. Why?" Da Vinci replied.

For a moment, Merlin and Iriviel didn't say anything. Then Irisviel broke the silence.

"For the root's sake, delete that voice clip immediately," Irisviel said.

"Why?"

"Just do it! For some reason, that voice angers me!"