Mama Box Set Description: "Episode 1 - After the death of his father, Yuichi comes to live with his stepmother, Yukiko. Yuichi doesn't know much about Yukiko, until he finds a video tape showing his father having sex with her. At his new home, Yuichi meets Mika, his step-sister. Mika is Yukiko's adopted daughter. Mika, having seen Yuichi's photo, is already in love with him.
"Mika watches the video tape as Yuichi unpacks his belongings. Yuichi is embarrassed, but Mika doesn't seem to mind. That night, Yuichi can't help but watch that video again, masturbating as he sees his stepmother and father get it on. That's when Mika enters his room. She tells him how she's been in love with him for a long time. Stripping off her clothes, she asks Yuichi to make love to her. Embarrassed and confused, he rejects her. Mika runs from the room and comes back with dozens of video tapes. Yuichi is shocked when he finds out that every single video tape shows Yukiko having sex with some new guy.
"Later that night, Yuichi is in bed, when Yukiko, completely naked, comes to his room. Yuichi is bewildered and excited. Not sure if he's awake or dreaming, he responds to Yukiko's sexual advances. Just as they reach their climax, Mika enters the room, naked except for the fake penis she's wearing. Mika has sex with Yukiko, while explaining to Yuichi that when she first saw Yukiko's sex videos, she too was shocked. Since then she has been using this fake penis on Yukiko in hopes of curing her nymphomania. After Yukiko has her orgasm, Mika turns to Yuichi. They end up having a sex too.
"The story concludes with Yukiko alone, watching a video tape of the sex they just had the night before. We aren't sure if Mika and Yuichi know about this tape or not.
"Episode 2 – The story opens with an accident that takes the life of Yuichi's father and leaves his mother confused -- her memory shattered. Yuichi, who is an adopted son, struggles to cope with his father's death and help his mother recover from the loss.
"One day, Rika, the family'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.
"On the anniversary of Rika's mother's death, Rika takes a day off. Yuichi is now left alone with Mama. The moment Rika leaves the house, Mama falls from her wheelchair and gets food all over her dress. Yuichi has no choice but to help Mama take a shower and clean up. Naked, Mama thinks Yuichi is her dead husband and calls him "Master" repeatedly. That's when Rika comes back to pick up something she forgot. Rika hears Mama calling Yuichi "Master."
"After everyone goes to bed, Rika comes to Yuichi's bedroom and offers to comfort him. As they have a sex, Rika reveals that Papa was Rika's mother's master -- and Rika is Papa's daughter. However, Rika doesn't want to be Yuichi's sister. She wants him to be her master -- just like Papa was her mother's master. After they finish having sex, Rika urges Yuichi to go to Mama. Mama is waiting for him. He must become Mama's new master too. As expected, Mama only sees Yuichi as her master.
"From that day onward, Yuichi becomes the new master of the house. They have sex day in and day out -- Yuichi treating Mama and Rika like his sex slaves. The story ends as Yuichi observes that he and Rika have ended up becoming part of Mama's confused and distorted world, instead of helping Mama to escape it."
