Hanabusa Sousuke is a sincere and gentle English teacher at day, but when night comes, his hobby is to fish for girls in a prostitution site.

One day while browsing for girls, he found one of his students in his class in his usual site. While hiding his true identity, he called her out at night to threaten her.

However, the one who appeared at the appointed meeting place was the beautiful honor student, Tsukinari Ema.

Apparently, her classmate discussed the issue with her, and Ema decided to talk to the coercer, so she went alone. With this, Sousuke decided to change his target to Ema.

Ema courageously struggled hard in order to save her classmate, but Sousuke's craftiness made her fall into his schemes, and eventually, awaken her latent masochist self...