The movie tells the story of a period when the biology teacher Yui Hatano has fun moments with her students and colleagues at a not-so-famous high school in the rural area of Shirakawa, Japan.
First, Hatano takes the initiative to get close to a problematic male student in the class, calling him to her private room to start discussing schoolwork. Of course, after a short time, the two begin to shift to a different 'topic,' one that is much more interesting and engaging than studying.
Not stopping there, Yui Hatano continues to have 'casual conversations' with her colleague who teaches physical education in... a private room, where only the two of them can 'talk' without anyone 'overhearing' (meaning being disturbed).
And finally, she switched to playing some games, using 'two guns' alone, not knowing if Hanato can handle it or not :)).