No Memory Woman(2004)

One day, when Mami (Yoko Mitsuya) wakes up in a strange room ... Beside her is a strange man, Yu (Ryosuke Watabe). Eventually Mami and Yu fell in love. Her younger sister Sato (Nahana) is worried about Mami who has lost contact. Sato consults with her boyfriend. However, Sato's boyfriend was Yu.