One: Kagayaku Kisetsu e(2001)

ONE: Kagayaku Kisetsu e

Orihara Kouhei returns to his town after a long disappearance to fulfill the promises he made to several girls in his childhood. He suffered from memory loss and carries a tragic past. A strange ambience surrounds the OVA...It's almost like a dream, like memories from the past trying to come together in one piece but without being able to...

(Source: Anime News Network)