Keihh is an NSFW artist who draws erotic images of characters from animes, such as: Kono Subarashii Sekai ni Shukufuku wo, Mushoku Tensei and Frieren: Beyond Journey's End.​

Tsukikawa kyousuke dreams about his younger sister, Saki. And she is so naive, believing that children are born from kissing. However, in the dream, Saki is not so innocent and have sex with her older brother for her, a mere trifle...