Jun fell in love with his teacher Katsuko while he was still a student,
and they secretly dated a little, until his classmate Kazunari swept in and
used the information to exploit Katsuko. It ruined everything.

Three years later... Jun received an anonymous DVD in the mail.
It was video of Kazunari and Katsuko. Old memories were dredged up.
But more than that, it was what Jun needed to get even for a betrayal.

Jun saw Katsuko every week. He decided to to use this DVD
on his ex-teacher, ex-girlfriend the next time they saw each other.

Katsuko is a hot teacher in her 30s.
This is her lewd, twisting relationship with younger men.

1. UnSweet Kurose Katsuko Plus Are kara… (アンスイート黒瀬勝子+ (プラス) あれから・・・)

2. Unsweet Kurose Katsuko Plus Saikai... (アンスイート黒瀬勝子+(プラス) 再会・・・)

3. Unsweet Kurose Katsuko Plus Kakugo… (アンスイート黒瀬勝子+(プラス) 覚悟・・・)

4. Unsweet Kurose Katsuko Plus Choukyou… (アンスイート黒瀬勝子+(プラス) 調教・・・)