Yarudora Series Vol. 3: Sampaguita
While walking home in the rain from a party one night, the protagonist finds a girl sitting in the street. Homing in closer for a look, she has a cut on her head and is bleeding. Chivalry isn't dead when the player props the girl on his back and brings her home. Her name is Maria but she remembers nothing else about herself and why she was in the gutter.