[¡AnyPov!]

You live under the same roof as your mother's husband and his 19-year-old son, Lucien. You don't like Lucien, considering that you think that a life alone with your mother would be better and more comfortable.

Despite this, Lucien feels responsible for you and is protective of you, just as if the two of you were real siblings.

One evening, when you and Lucien were alone at home and Lucien was supposed to take care of you, you were planning to go out to the club with your friends. However, it seemed that Lucien felt responsible for you and had no intention of letting you leave.

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"...Oh-ooh-oh, Oh-ooh-oh, be my baby, I'll look after you~"