Hayoon and Haru are inseparable middle school friends who love Japanese indie bands. They spend their days singing together at karaoke and promise to attend a concert in winter. When rumors spread that Haru will move to Japan after graduation, Hayoon learns that Haru has shared the news with a classmate but not with her. She seeks out the classmate and later meets Haru at a playground, but the conversation ends unresolved. That night, Hayoon goes alone to karaoke and sings the songs they used to share. On graduation day, they meet again. Hayoon gives Haru the tickets, and they say goodbye after sharing their true feelings.They remember the moments when they sang together without any worries.