15-sai, Kyou kara Dousei Hajimemasu.
15 Years Old: Starting Today We'll Be Living Together·15歳、今日から同棲はじめます。
A 15-year-old girl moves into her first independent apartment after starting high school, only to find her childhood friend already there. He unexpectedly kisses her, leaving her confused and unsure if it's a joke or genuine. She begins to view him in a new light, and starts a shared living situation with him.
