Her older sister, Hikaru, is quiet and withdrawn. Her younger sister, Runa, is a and sociable. Even though they are twins, their personalities are so different. Hikaru's longing is Kouki, a popular influencer. Runa is a SEX friend with Kouki! - "I want to be embraced by Kouki-kun!" - Hikaru is lonely and delusional masturbation. At some point, I decided to pretend to be my sister