Two sisters in an intimate relationship? This is too trivial and simple for today's hentai ... Hinata and Sayachi are inseparable sisters, they do everything together - study, clean up, go to the same circle (archery) and of course have sex. Hinata is stronger in everything in sports and in her studies, and Sayachi will never keep up with her. They have a mutual friend, an annoying photographer Tachikawa, who constantly sends some pictures to Hinata. One day Sayachi receives a message with a huge number of vulgar photos of a girl in her underwear. Then videos with this girl and various sex toys began to come. However, the face was not shown anywhere, but for some reason Sayachi felt her body painfully familiar. Soon she receives a video of a girl being deprived of her virginity ... The next day, Sayachi discovers Hinata having sex with a photographer in the backyard of the academy. She will later try to protect her beloved sister, but she will not succeed and she herself will become part of Tachikawa-kun's depraved plan.