Yuu Natsume met Himari Inuzuka back in middle school, when he was selling handmade flower accessories at the school festival and she stepped in to help him sell them. Years later, in their second year of high school, she is still his self-declared best friend, modeling his pieces and talking them up to anyone who will listen. The joke she made back then also still stands: if neither of them is with anyone by the time they turn thirty, she'll marry him herself. This manga adapts Nana Nanana's light novel.