Two childhood friends attend Takafuji Gakuen: Yuuki, who wants to fall in love, and Chisato, who hates chocolates. They are part of the food research club along with their friend and classmate Mifuyu. Even though it's a food research club, they don't actually do anything except for buying candy with the club budget and enjoying their time together.

Burdened by the debt his father left behind, Okonogi Masaya is now destitute and alone. However, through a strange collection of events, he finds himself living at the prestigious Vincennes Academy, an all-girls charm school!

Lute is a recent graduate of the Knight Academy. Due to him not being a very good fighter, Lute is assigned to a backwater border town. However, an encounter with a beautiful and deadly succubus will lead him to uncovering a conspiracy against the crown.

In a world where powerful nations run rampant and heroes battle one another for supremacy, our memory-loss stricken main character has a fateful meeting with a hero of Yamatai. Together, they set off into a world covered with the burning embers of war.

A long time ago, unknown beings known as Kotona invaded Earth in search of food. Humans were unable to repel them until some people gained special abilities known as douryoku which allowed them to exterminate the Kotona. Now, Seiichi attends Kashinomori Academy which trains people with douryoku in preparation for another attack.