Eight years have passed since they promised the witch to keep loving each other.
A little naughty love story where adolescent childhood friends secretly observe each other.

Hardworking level one magician Konoha is apprenticed to lazy Knight Protector Saionji Ikumaru. They both work to keep the ether world sealed away from their own but sometimes the seal doesn't work. Dragons, demons, and now Ishtar, the goddess of Venus. Will Ishtar help Konoha win her master's affections? Or will she take him for herself?

From Kirei Cake:

It's been declared that Nishi High will close in two years. Since then, the student population has dropped to a mere seven. Hazakura Motoya, one of the remaining students, decides to stay for the free ride through high school.

Suddenly, everyone is shocked when they receive three new transfer students, Kayama, Mizumura, and Toujou, girls who are actually members of a special military division.

Soon after, Motoya and the three girls witness a giant tower suddenly appearing on the school grounds. Motoya is destined to enter with the girls in order to uncover the mysteries of this tower.