Danjo no Yuujou wa Seiritsu suru? (Iya, Shinai!!)

男女の友情は成立する?（いや、しないっ!!）

Childhood BFFs Himari and Yuu’s vow of friendship hits turbulence when Yuu reunites with his first crush in high school. Himari, who’s never known the fuzzy warmth of a crush, now must confront her feelings. Their shared dreams and peaceful days as a twosome gardening club are tested in this tale of love, flowers, and growing pains!

(Source: Crunchyroll, edited)