This isolation leads the siblings to cross the line from familial affection to a romantic and sexual relationship. However, their secret is quickly discovered by , Yuuto's art teacher at the university. Sayaka, who is revealed to be a nymphomaniac, uses her knowledge of their taboo relationship to manipulate and seduce Yuuto for her own desires. English Dub and Production Details

The story follows and his younger sister Erika Toudou . Though they share a last name, they are not related by blood; Yuuto’s father remarried Erika’s mother when they were children. Following the death of their parents and their father's job transfer to Sapporo, the two find themselves living alone in their family home.

is a two-episode adult OVA (original video animation) series released in 2006, based on an erotic visual novel developed by the studio Empress . Often recognized for its association with the creators of famous titles like Bible Black and Discipline , the series explores themes of forbidden romance and obsessive relationships through high-quality animation for its era. Series Synopsis: Episode 1

In the context of online media distribution, terms like typically refer to technical encoding or restoration efforts by community groups rather than official release titles.

Dubbed by Mitzi Shanks (or Hilary Thomas in some credits)