15-sai, Kyou kara Dousei Hajimemasu.  

15歳, 今日から同棲はじめます., 今日から同棲はじめます., 15歳

Hiyori had planned on maintaining a platonic relationship with her childhood friend Soushi after high school. However, as time passed, she found herself developing stronger feelings towards him. Eventually, Soushi surprised her by kissing her, leaving Hiyori unsure of whether he was teasing her or if this was a genuine expression of affection. Despite her initial confusion, Hiyori began to see Soushi in a new light as a man, leading her to embark on a new chapter in her life living with him at the age of 15.