Can a Boy-Girl Friendship Survive? (No, It Can't!!)

男女の友情は成立する？（いや、しない！！）

In middle school, Yuu Natsume made handmade flower accessories nobody bought, until his classmate Himari Inuzuka offered to model them for him. That small act of friendship carries into high school, where Himari has become the face of the accessories he sells online. It is also where she has made him an odd, half-joking promise: if he is still chasing his dream of a shop of his own, unmarried, at thirty, she will be the one to marry him. This light novel is the original source for the manga adaptation.