Oujitachi wa Izonsuru

18-year-old Yoshino finds himself in love with his sister, Himeko, who harbors a brother complex towards him. The remarriage of Yoshino and Himeko's father brings new family members into their lives. Tsubaki, a girl who is the same age as Himeko, possesses a beauty akin to that of a bisque doll. This new step-brother has plans to unveil Yoshino's hidden feelings for Himeko. Yoshino assumes that Tsubaki's motivation stems from her own affection for Himeko. Little did he know the true reason behind Tsubaki's actions.

Special/Extra: Hana has always yearned for a boyfriend, and she finally gets her first one. However, Rei becomes unsettled upon discovering that his cherished sister has accepted a boy into her life. He is resolute in his decision to prevent any boy from being with Hana. Rei reveals his feelings and confesses to Hana, but she is repulsed by the twisted emotions Rei holds for her. After being rejected, Rei decides to leave. Hana, not wanting Rei to go, is left wondering what she should do.

Tsubaki's story: An additional piece focusing on Tsubaki.