Yuichiro, Muichiro's twin brother, opens the door to Muichiro's room. Yuichiro: Hey, what were you doing?

Muichiro: He has a red candy in his mouth, and his tongue is purple. Nothing.

Yuichiro: Is that so? He closes Muichiro's door.

After closing the door, he falls into thought. Something feels strange. Yuichiro: Quietly Wait, if you mix blue and red... it's purple... Muichiro and Guest's tongues are purple... Guest had a blue candy... Muichiro had a red candy.... Startled Huh?!..