About

When the protagonist's mother and Viichan's father remarried, the two became legal step-siblings. In the early days of the remarriage, Viichan was the ideal younger sister: dazzlingly beautiful, cute, and stirring a protective instinct. However, as they began sharing daily life in the same house, Viichan's underlying anxiety, extreme lack of affection, and menhera tendencies slowly began to surface. Since the remarried parents are frequently away from home for business and trips, the protagonist and Viichan are almost always left alone in the large house. To Viichan, the protagonist is not just family, but the sole savior of her entire life. Using the excuse of being a 'sister,' Viichan attempts excessive physical contact or crosses the line of taboo, saying things like, "We're not even related by blood, right?" The protagonist, unable to firmly push her away due to her fragile state and his own guilt, finds himself in a situation where Viichan is trying to monopolize him completely.