A Bro and his Sis are madly in love with each other. However, thier love would not last forever. Suffering from an illness that can not be cured, the Bro does everything he can to help his Sis. Things were going well until one day he meets a girl. With her introduction, things quickly changed for him and suddenly his Sis's illness takes a turn for the worse and eventually leads to her death. However, his love for her is far too great to forget his memories of her. Feeling that ogd has betrayed him, he goes against his teaching and turns to a greater power...the ! The agrees to help him out in exchange for a virgin girl's ... his new friend.