Yuuto's step-sister, who secretly has a crush on him. She expresses it through jealously and teasing of Yuuto's "oedipal" attraction to his step-mother. Their relationship changes after an argument in which Yuuto complains that Erika is too absorbed in her studies and no good at household chores. She ends up offering to help him in another way by giving him sexual favors which he readily accepts. They attempt to keep to their relationship a secret, but others notice the change in the siblings. Among them is Yuhi, a fellow female classmate, who is romantically interested in Erika. 

From the authors of Bible Black and Discipline comes this new OVA based on a game with the same name.<br><br>
When their father is given a transfer, Todo Yuto and Todo Erika are left alone. They are siblings, but they are not blood related. When Yuto was a child, his mother died. His father remarried a woman who, herself, had a child from a previous relationship, Erika. His stepmother was quite gentle, but she, too, has since passed away. Living alone, they begin to love each other as a man and a woman. However, an art teacher, Sayaka, notices their relationship and...<br><br>
(Source: AnimeNfo)

She is a voice actress for eroge and adult anime.

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Erika Todou