Science teacher Shinami-sensei had failed with his investments. As a result, all of the girls he was dating cut ties with him.

Around the same time, he found out his female student Yusa's secret. However, she also knew of his "shortcomings" and ended up getting the upper hand. Threatening Shinami-sensei, Yusa forces him to live with her.

As he gets treated like a plaything by his bespectacled, braided and plain student, Yusa, Shinami-sensei gradually learns more about her "true" self...

Shinami-sensei also changes a little- as a person, as a teacher and as an adult.

[Mostly based on the translation of DL Site's plot summary]
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