After story – Kakusei Kanojo (Takenoko Seijin)
The story started from 4 months later after their broke up. Heroine and cuckold started to have relationship 7 months ago and they broke up with small argue 4 months ago. After that cheeter (university student) stole her from him and trained her as hard masochist. Eventually, the cheeter got tired of her and dumped her to cuckold.