My Blooming Sisters (花咲く妹たちHanasaku Imōto-tachi) is the 10th episode of the Kono Naka ni Hitori, Imouto ga Iru! anime series.
With the help of Yuzurina's influence, Shougo Mikadono invites the five girls to the Mikadono Group party. Miyabi has been acting indifferently during the party and has sudden gone missing. While looking for her, Shogo and Ikusu reveal that Seri is in allegiance with someone who is plotting to remove Shogo's candidacy as the next head of the Mikadono Group via a scandal, and Ikusu advises Shogo to lay low for the time being. Afterwards, Shogo reports his findings to Yuzurina, who has found Miyabi in the hotel, and while dismayed about Seri's scheme, he adds that she is fine with publicizing herself as Shogo's little sister. After being told to live a virtuous life by Yuzurina, Shogo heads back to the party. However, he is lunged by a drunk Miyabi who is eventually rendered unconscious, taking her to a hotel room and waiting for her to wake up. After taking a shower, Miyabi attempts to have sex with Shogo, but she then cries, asking Shogo to never leave her. Later, after seeing the other girls off, Kanoko discusses with Shogo about what has happened and discovers that Seri is actually responsible for inviting the girls.