本剧讲述了理音是怀揣梦想和希望，投身于教育现场的Z世代高中教师。但是，其残酷程度超乎想象，在工作的第2年，每天都过着充满压力的生活，甚至想要辞职。扩大解释“自由”的学生们、对学校寄予过分期待的家长和附近居民、把处理纠纷的责任推给年轻人的年长教师… 理音把这些抱怨写在SNS上，向温柔的男友倾诉，“老师也是人!”一边适度地发泄，一边用天生的活力和开朗勉强保持着平衡。然而，理音突然成为了高三学生的班主任，她的命运是…

A film adaptation of a play made by a high school drama club, directed by Yamashita Nobuhiro of Linda Linda Linda (2006). It’s essentially a coming-of-age film about teenagers made by teenagers. During summer vacation, at a high school, the PE teacher makes female students who skipped his class clean the outdoor swimming pool. The drained pool is full of sand blown in from a nearby baseball field, and the task of scooping up the sand and putting it in buckets seems meaningless. Chizuru, who used to be unbeatable in the swim club in middle school even against boys, practices imaginary swimming in the sand-filled pool, while Kokoro, who is serious about cultivating her feminine charm by diligently applying makeup, doesn’t care about cleaning. With their own stories, Miku, who diligently practices dance moves typically performed by men, and Yui, who was the swim club captain last year, and the other girls meet and converse on the pool floor under the summer sun, where unexpected conflicts arise and resolve in unexpected ways. Through a few hours in a day at a high school, the film interestingly shows the sensibilities and desires, dreams and hopes, anger and frustration of that time.