Ansatsu Kyoushitsu

The story is about class 3-E of Kunugigaoka Middle School, where every morning they greet their teacher with a massive firing squad. The teacher is a weird combination of an alien and a octopus that moves at speeds of mach-20. It turns out this creature was responsible for the destruction of the moon, rendering it forever in a crescent shape. He has announced that he will destroy the world in one year. The creature will teach class 3-E how to assassinate him before the year is over.

Volume 21 contains Tokyo Depato Sensou Taikenki (Tokyo Department War Memoir)
A girl named Yuzuko, wanted to buy a new wristwatch for her father in the department store that pierces through the heaven. On her way, she got attacked by an one piece dress. A mysterious dude came out and helped her. Just what is the ‘desire’ that he’s talking about? And just what kind the department store it is?