Anitomo to Sefure ni Narimashita

Mako Momozono's boyfriend ends their relationship after she refuses his advances. After drinking heavily, she falls asleep on a bench and is found by Arata Shichimiya, a friend of her brother who is fixated on his sister. Arata takes her to his home, where she wakes up the next day in an unfamiliar room, disoriented and in pain. She notices red marks on her body, aching hips, and finds herself naked. Mako and Arata begin a friends-with-benefits arrangement, though an unexpected complication arises.