Takato lives alone since his parents are hardly in the house due to work. He enjoys a pleasant school life with his osananajimi Akane and best friend Shuuichirou. One day, he received a delivery the size of a coffin from his parents, inside of which was a sleeping naked girl. She was accompanied by a note telling him to seek out the truth with her. At that time, the girl opened her eyes and his fate began to change.