The story takes place at St. Francesca Academy. After the battle between the students ended, they all go to a southern island.

After regaining her squid-like abilities, Ika Musume plans to resume her self-appointed mission to destroy all of humanity. However, her carefree job as a waitress in the Lemon beach house meant she cannot help but laze around during her spare time!...

Thousands of years ago, it was a time of witchcraft and dark magic. An evil sorceress has bewitched the emperor of the mighty dynasty and he has become a mindless puppet. The country is in shambles, and evil spirits lurk everywhere. The human world...