Boku to Kimi to de Niji ni Naru僕と君とで 虹になる; 僕虹; 妳我的彩虹青春; 架起你我的彩虹; Boku to Kimi to de, Niji ni Naru; Boku to Kimi tode Niji ni Naru; Boku to Kimi tode, Niji ni Naru; Me, You and the Rainbow; You and I become a Rainbow

From Chibi Manga: Because she loved the word "wisdom", Rui hated the words "waste" and "fuzzy". One day, a guy named Shou appeared on her life. And thank to that encounter, Rui will suddenly change... And that's the beginning of a "rainbow school daze" between that super dry girl and that careless guy.