Yū Natsume, a mild-mannered passive boy who loves flowers, and Himari Inuzuka, a beautiful girl with a cheerful and outgoing personality, spend a peaceful time alone together as best friends in the gardening club in their second year of high school.
They became friends two years ago when Himari helped Yū sell his flower accessories at the cultural festival of their junior high school. Fascinated with the bright eyes of Yū focusing on making accessories, Himari pledged to be his “destined partner (best friend),” and help him make his dream come true of opening his own shop as a flower accessory designer. Since then, they have maintained a relationship famous among their classmates and families.
Yū has started selling his handmade flower accessories online under the name of a convenience store run by his family and is making steady efforts to realize his dream. Himari, on the other hand, declines an offer from an entertainment agency and helps Yū advertise his accessories, making friendship with him a higher priority.
Just then, Yū runs into his first love, Rion Enomoto, with whom he fell in love on a trip when he was in elementary school. This unexpectedly causes the friendship between Yū and Himari to lose its balance…!?

An eternal friendship that turns into a mutual crush!? This romantic comedy is set in Nobeoka City, Miyazaki Prefecture.