急に降ってきたよね――。
中学生の吉岡双葉（出口夏希）と田中洸（櫻井海音）は、雨の日を境に互いに惹かれ合っていく。目が合うと、必ず一度そらして、また合わせる2人。しかし、洸は何も告げぬまま突然転校してしまう。高校生になり、友達から嫌われないように自分を偽る双葉は、クラスで孤立する槙田悠里（莉子）のことが気になり始める。そんな双葉の前に、洸に似た男の子が現われるが、彼は“馬渕”と呼ばれていて――。
Junior high school students Futaba Yoshioka and Kou Tanaka are drawn to each other after a rainy day. Whenever their eyes meet, they always look away at first, and then their eyes meet again. However, Kou suddenly transfers schools without telling anyone. Futaba, who has been pretending not to be herself so that her friends do not hate her, begins to worry about Yuri Makita, who is isolated from the rest of the class. Then, a boy who looks like Kou appears in front of Futaba, but he is called “Mabuchi”.
