Since Tatsumi Ryou was a high-schooler, after losing his parents in an accident, he was taken in and raised by Madoka.
One morning, Ryou finds Madoka missing and is astonished by the reason given to him by the visiting Fumi, the Yotsuya family maid. In order to help Madoka repay her debt owed to the Yotsuya family, Ryou agrees to work for them. Thus, he is taken to the Yotsuya mansion where he serves Akie's, the head of the Yotsuya family, physical needs.
One day, Akie's sister, Reiko, comes to visit. She finds and Ryou interesting and summons him to her room. When he enters, Ryou finds Madoka present.
~ translated and adapted from official site by Cranston
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