The story opens with an accident that takes the life of Yuichi's father and leaves his mother confused & her memory shattered. Yuichi struggles to cope with his father's death and help his mother recover form the loss. One day, Rika, the HouseHold's faithful servant, is helping Mama take a bath when Yuichi hears an unusual noise coming from the bathroom. To Yuichi's shock, Rika is sexually comforting Mama. After everyone goes to bed, Rika comes to Yuichi's bedroom and offers to comfort him. As they have sex, Rika reveals that Papa was Rika's mother's master and Rida is Papa's daughter. After they finish having sex, Rika
...Read More urges Yuichi to go to Mama. Mama is waiting for him, he must become Mama's new master too.