It was already sunset at Peach's Castle. Upon exiting the second course, Yoshi and Mario walked over to Princess Peach who was happy to see her hero.

Mario: Hello Princess!

Peach: Mario!

The two ran towards each other and Mario lifted her into the air, sprung around, and put her back down before hugging her.

Yoshi: Wow! I've never seen you two this happy to see each other before.

Peach: I've been so worried about you. What happened?

Mario: Well, I'm not sure if you're gonna believe this. But last night, my fireplace was acting weirdly, so I went to investigate until this… THING grabbed me and Luigi. I woke up stuck in this red barrier on the MOON, and I saw Luigi, Toad, Wario, and Waluigi also trapped in barriers matching their colors. Then we heard this creepy voice telling us that soon the moon will crash into this planet, and kill all life as we know it! I was soon rescued by Yoshi, who grabbed this red orb that brought me back here. I don't know what it is we're dealing with, Princess. But it's definitely a bigger threat than even Bowser.

Peach: Oh no…

Yoshi: What are we gonna do?

Peach: Just keep collecting stars. If we get enough of them. We can stop this evil threat. And maybe you'll find the orbs to your other friends as well.

Mario: Then we better get going. There's no time to waste.

Peach: You can take the boat to Sunset Islet. I'm sure there's more stars to find there.

Mario: Thanks Princess. C'mon, Yoshi!

Yoshi: Coming!

Mario and Yoshi jumped on to a boat on a dock and took off for Sunset Islets. During which, Peach looked up to the sky to see the moon getting ever so closer.

Peach: Please hurry…

Sunset Islet

Sunset Islet was a peaceful islet known for its most beautiful sunsets, similar to Sirena Beach. It's notable landmarks are a lighthouse near the coast, and a stone mountain that the light is currently shining on. Mario and Yoshi arrived and got off the boat. Mario smells the air s sighs.

Mario: Smell that fresh sea air. I'm getting Isle Delfino vibes from this place already.

Yoshi: Wait… ISLE DELFINO?! You've been there?!

Mario: Yup! Luigi and I went on vacation with Peach and her family. I finally saw her sister, Daisy again after such a long time. And she's now Luigi's girlfriend! I also found out she had one more sister named Aqua. She's really young. Only six. And we got along really well! She's like a daughter to me.

Yoshi: Oh, so that's who wrote that letter I found back at Stonesnake Shatters. She packed this hose with two ends in a blue box and sent it there. It was really helpful.

Mario: You mean FLUDD?!

Yoshi: Yeah, that. Anyways, my cousin, Melon lives on Isle Delfino! Did you meet her?!

Mario: Oh yeah! We did! We saved her from these giant koopas that ate Yoshi's and tried nibbling on the roots of sunflowers.

Yoshi: That sounds awful! Well, I'm glad you saved her in time! She must have a pretty good asset to the team. Of course, it's a shame she can't swim. Next time you see Aqua, come over to my place, cause I would really like to meet her.

Mario: I'll be sure to arrange for that some time. You know, I am considering inviting her to the next Mario Kart. So, you'll definitely meet her by then. Now, let's-a go find some stars!

Yoshi: Yeah!

Star #1 Labor in the Lighthouse

Mario: Why don't we check that lighthouse first? It like there could be a Star there.

Yoshi: You lead the way.

Mario and Yoshi walked up to the entrance to the tower. Inside were spinning platforms requiring precise jumps to reach.

Yoshi: You know, the inside kinda reminds me of the Windmill Hut from Ocarina of Time.

Mario: Huh?

Yoshi: Oh, sorry! I just broke the FIFTH wall!

Mario: Okay?

The two reached the very top and grabbed the star.

Star #2 Move to the Mountain Top

After exiting the lighthouse, Mario hit a ! block to release two white caps.

Yoshi: Hey! The caps are back! I wonder what these do.

Mario: Let's-a find out!

They put on both caps. Mario gains a white cap, white shirt, and red overalls. Yoshi's body turns red. They were now Fire Mario and Fire Yoshi.

Fire Mario: Wahoo! My first powerup! Well… if you don't count the Super Mushroom, but I digress.

Fire Yoshi: Finally! I get to actually use this thing. What do you say we explore that mountain in the back?

Fire Mario: Good idea.

Mario and Yoshi used a boat to get to the mountain. There a wall of rocks were blocking a caved in cave, with explosive barrels next to them.

Fire Mario: How about you do the honors, Yoshi?

Fire Yoshi: With pleasure!

Yoshi breathed fire to make the barrels explode and clear the cave. Both went inside and claimed another star. While also turning back to normal.

Star #3 Blimp and Lighthouse

Getting back to the lighthouse, Yoshi noticed something strange.

Yoshi: Look!

Mario looked to where Yoshi was pointing at. It was the shadow of a spinning star on the lighthouse's light shining on the mountain.

Mario and Yoshi: It's the Star signal!

Mario: That means a Star needs our help!

Yoshi: Right! To the Mario mobile!

…

…

Yoshi: Sorry, I'm enjoying this superhero play.

Mario: I'm sure we can find a way to get up.

Both walked around and saw a deflated pink balloon with a happy face implanted on it.

Mario: That's our ticket! Time to pump it up!

Both ground pounded on the pump to blow up the balloon to serve as a platform. Once they got high enough, both heroes long jumped over to the Star right in front of the light.

Mario: YAHOO!

Yoshi: YOSHI!