Naruse Uta, an utterly ordinary high school student, harbors a secret he cannot share with anyone. He is in love with Kaoru, his older brother's wife. Though it is a love that can never be fulfilled, the joy of everyday life is bittersweet, and watching his brother's newlywed life makes his heart ache. She suppresses her feelings, hoping that the love she has quietly kept in her heart will not awaken.