Satsuki, a dedicated and student-minded teacher, has guided all her students to graduation over many years of teaching. This year, she was in charge of troublesome delinquent students, but thanks to her strict guidance, everyone was able to happily attend the graduation ceremony this year too. Satsuki, who saw off her students with a bright expression, was alone in the empty classroom, immersed in memories, when the classroom door was suddenly thrown open, and the ones who approached were the delinquent students. Surrounded by them, who said, "We wanted to thank the teacher for everything she's done..."