A high school girl was collapsed in front of an apartment…!? After encountering the scene on her way home from work, Shinonome Kohana couldn't just leave her there and carried her to her room to take care of her. After that, Harukaze Rio, who frequently visited Kohana's room, was a girl who felt love in pain. Unable to respond to Rio's demands for violence, Kohana still found her heart racing at her expressions and gestures, wishing she could stay by her side. "I've fallen in love with another girl again." Will Rio turn to Kohana's feelings? A slightly painful and gentle love story, Volume 1.