A boy and a girl pledge lifelong friendship in a small town junior high school. The relationship between the two, who are destined to share a common dream, has passed two years without any particular development. Himari Inuzuka, a bubbly girl who has yet to find her first love, and Yuu Natsume, a plant-loving boy who enjoys flowers, still spend their days peacefully as best friends in the gardening club in the second year of high school. "If Yuu can't get married, I have to take responsibility." "I'm having trouble now because after Himari said that, your brother began calling me 'My brother-in-law!'" However, when Yuu reunites with his first crush, the gears of their relationship suddenly go out of sync! Will Himari be able to escape her "ideal friend" now that she has found love?