In the near future, an ominous red star appears in the sky. Its presence is about to bring about the extinction of all life on Earth. The government proposes an evacuation project to take all of mankind into space. Ryou Haruna, a soldier, is sent to watch over Sion, one of the modified superhumans that are humanity's only hope for survival.

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!

Kashou, the son of a long line of Japanese confection makers moved out to open his own shop 'La Soleil' as a patisserie. But upon moving out, hidden amongst his things were two of the catgirls, Chocola and Vanilla, that the family had been raising.

Rei Sawatari inherited one important item from his grandfather, a pocket watch with the power to go back 5 minutes in time. If he uses it well, then there's no telling what he could accomplish. He could even save the world...

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.

A woman with eyes of jade stands before You, informing You that You are the Master of the house, and she Your Maid. However, You have no memories, no concept of self, or indeed, any certainty that You are even alive.