Dousou Kai
English name: Yesterday Once More
Genres: Romance, Hentai
Type: OVA, Episodes: 4
Aired: Mar 27, 1998 to Dec 18, 1998
Studio: Arms
Source: Visual novel
Rating: Rx - Hentai
Synopsis:
A young group of friends meet up for the first time in a very long time after finishing high-school. One of them remembers how once ago a girl left him Daisies and a love letter inside his locker, back in the high-school days. He has three suspects of who this secret lover could be and so there is only one way to know... by having sex with all of them.

(Source: AniDB)