妹と呼ばないで

Two stories in movie. Story 1 Yukka is in Tokyo for university entrance exam, and she has to temporarily stay with her Cousin Yoshi. Yoshi is surprised to see his little cousin is grown up as a young beautiful girl. Yoshi cannot help but to fall in love with Yukka, and their relationship starts to change intensely after sudden incident... Story 2 Massah and Misak half-blood siblings. Their father goes on business trip and leaves the siblings staying at home alone. One night, Misak feels depressed coz of sudden break-up with her boyfriend, Massash sympathizes her charming little sister. However he finds his love towards Misak is out of control... results extreme.