is a Japanese adult manga series written by Hirafumi and illustrated by Yabi Shinba. It began serialization online on the Comic CMoa service under CLLENN's DEDEDE label in November 2022. An anime television series adaptation produced by Studio Hōkiboshi aired from January to March 2026.
Plot The series follows Kōta, who gets a new younger sister named Aika after his father remarries. Aika is a with a dual personality: she acts kindly to her parents, but shows a brattier side to others, including Kōta. Aika quickly develops a fondness for her new stepbrother, and the two form a sexual relationship.
Characters
Media Manga
Anime An anime television series adaptation was announced on September 5, 2025. It is produced by Studio Hōkiboshi and directed by Pyuta Konno, with Eeyo Kurosaki handling series composition, Yoshihiro Watanabe designing the characters, and Aiue Oka composing the music. The series aired from January 5 to March 23, 2026, on BS11 and Tokyo MX as part of AnimeFesta. The ending theme song is , performed by Yuka Akashi and Yui Otokura. OceanVeil is streaming the series.
Notes
References
External links Manga official website Anime official website