Our hero, Makoto, is a weak student learning kendo (Japanese fencing).

Makoto and a teacher at his academy, as well as his kendo instructor, Aoi, are secret lovers.

However, when their relationship becomes known to the dojo leader, Aoi's father, he demands that if Makoto loses in the kendo match 2 weeks away, he must break up with Aoi.

In order to give confidence and courage to the fearful Makoto, Aoi arranges for them to stay the night alone together and makes him make love to her!

[From DLsite English]