Satsuki is a passionate and caring teacher who has guided all of her students to graduation during her many years of teaching. This year, she was in charge of some troublesome delinquent students, but thanks to her strict guidance, everyone was able to attend the graduation ceremony in style again. Satsuki saw her students off with a beaming smile, and was reminiscing in the empty classroom when the classroom door slammed open and the delinquent students approached. "...