Narumi Takayuki is in his last year at Hakuryo Hiiragi Academy and has no idea what comes next. At a summer festival, his classmate Mitsuki introduces him to Suzumiya Haruka — intensely shy, deeply introverted, and visibly uncomfortable in the crowd. When Haruka later calls him out to the hill behind the school and confesses her feelings, he finds himself unable to refuse, knowing how much courage it must have taken her. He agrees to date her even though he has no particular feelings for her. The early days are strained and awkward, exactly as he predicted. But time changes things. As Haruka gradually opens up, Takayuki finds himself unexpectedly falling for the person she actually is. And then one day, something changes everything.