Dentro de esta historia, un misterioso botón se hace presente en cuatro mundos distintos, aquel personaje que lo pulse será transportado a otro mundo, en el que se reunirán con aquellos otros que también hayan pulsado dicho botón.
An eminent new student comes to the school.
An eminent shadow lurks in the school.
The class works together to grow morning glories.
The class gets together to cook pasta.
Motoyasu comes to the school, but he sees every girl he meets as a pig.
Tanya searches for the identity of the mysterious "Shadow."
The whole class goes on an exciting ski vacation.
Everyone starts skipping when a new hit game comes out.
The classes are suddenly told about an upcoming music festival.
The day of the music festival arrives, but, naturally, it won't take place without some setbacks.
The school will have to face a giant zombie bell before receiving the festival prize.