Shindo has moved in with his new stepsister, and she wants this to remain a secret at her school. However, when the two are alone, his new roommate behaves very strangely, as she usually wears almost nothing in the house and also likes to let him watch her. The quiet boy increasingly gets the feeling that his new Gal sister wants something from him …
いもうとはGALかわいい, Imouto wa Gal Kawaii, 여동생은 귀여운 갸루