Protagonist who spends lazy everyday happens to meet a dying mystery man who has been defeated by a magic girl.

[Please defeat the magic girl.]

Protagonist succeeds the desire of the mystery man who dies, it is sworn to defeat the magic girl. And information are collect to investigate real identity of a magic girl while watching the fight of a magic girl and the mystery man. The identity was a classmate and student council president Toudou Ichigo.

The magic girl is unreasonable strong, it doesn't become a match really, it attacks before it transforms. Protagonist does stalking of Toudou Ichigo and looks for the weak point of the magic girl.

And Protagonist finally finds magic girls fatal weak point. The more it uses magic, when the transformation is solved, the sexual desire is increased.