Kimi to wa Gokai kara Hajimarimashita ga

A high school student named Miike Kazuya, who is kind but tends to be pessimistic, writes his first love letter. He addresses it to a female student he sees while commuting to school, intending it for someone he calls "Hifumi-san." However, due to a misread name, the letter is given to the girl's older brother instead. The story explores the developing relationship that begins with this misunderstanding.