Taka ga Fukuen

1-3:
The reunion of two people who were sex friends in high school, 20 years later, when one of them is a lonely soul fast passing marriageable age but still dreaming of his first love; the other, a cold, business-oriented man who wants nothing more than to forget their past together.

4-5:
A rape victim hides information from the police, thinking his attacker loves him. A certain police officer is determined to shatter this misconception and nab the rapist, but his methods end up being a bit... unorthodox.

(Source: MangaDex)