Mizuiro [Best Version] Japan

Mizuiro is a visual novel made by NekoNeko Soft released in 2001. It has versions for four different platforms: PC CD, Dreamcast, PlayStation 2, and PC DVD-Rom. There were two anime OVA adaptations of the game, a two-episode Hentai OVA in 2002 and a two-episode non-Hentai OVA in 2003. Both have same characters, but with somewhat different storylines.