Top student Sousuke Tachibana has been writing love letters to his savior—the "cute Kijima-kun"—in gratitude for helping him in a dire situation. However, due to a misunderstanding, the recipient of Sousuke's letters turns out to be a different person with the same surname: Subaru Kijima, a troublemaker known for his scary face. When he catches Sousuke red-handed, Subaru demands him to take responsibility for his feelings and the questionable content of the letters. Instead of frightening, Sousuke finds Subaru quite adorable, so he kisses him and accepts to go out with Subaru until the day the latter falls for someone else. For Subaru, this solution would be perfect if it were not for the fact that he is already in love with Sousuke! Convinced that he is not good enough for Sousuke due to his frightening appearance, Subaru will have to find a way to overcome his insecurities and convey his true feelings.