Yuzuki-kun finds himself in a difficult situation: he is teaching his student Reina-chan. Reina is a beautiful girl with a charming appearance who attracts attention not only with her intelligence but also with her natural beauty.

The story begins with tragic events, in the center of which a girl named Nanase finds herself. Her father, a professor, is suddenly accused of murdering his student, who was his colleague and classmate Nanase.

Every night, Takage dreams of other worlds he lived in many years ago. In these dreams, he relives the events of his past life, filled with love and grief. In one of his dreams, he recalls a passionate night with a priestess named Ayame. But after that night, her life ends tragically. Takage knows it's just a dream, but the memory of that night remains with him.