푸른 하늘 아래 매월 1일마다 영화를 보기로 약속한 ‘미유’와 ‘슈야’. 하지만 ‘슈야’의 변심에 약속은 깨지고 만다. 충격에 빠진 ‘미유’ 앞에 다시 나타난 ‘슈야’. 그 순간, 트럭이 돌진하고 ‘슈야’는 ‘미유’를 감싼 채 교통사고를 당한다. “딱 하루만 시간을 돌려주세요!” 눈을 뜬 ‘미유’ 어제와 같은 하루가 반복된다는 사실을 깨닫는데… ‘슈야’를 구할 수 있는 마지막 기회! 널 위해 미래를 바꿀게
Ishimori Uka is very shy and has a hard time making friends. When she was a middle school student, students made fun of her by calling her "stone". Around that time, she met Miura Kai with lemon color hair. Because of him, she entered the same high school. Uka now wants to overcome her shyness and have friends. Kai is a popular student at the school, but he doesn't talk much or seem interested in others. He doesn't know why, but he becomes concerned with Uka. Uka has admired Kai, and she now has feelings for him. Kai has a secret, which no one knows.
