Yuri's life is getting busier with her work and personal life as she prepares for her own wedding next spring and the students she is in charge of are entering the period of career guidance. At this important time, there is one student who worries her... Nitta, one of her students, had excellent grades until Yuri came to teach at her school. He doesn't seem to be concentrating on his classes and does poorly on his exams. Worried, Yuri asks him about the situation, but Nitta won't open Kokoro and mutters, "It's all my fault, teacher." However, one night, Yuri finds out what Nitta is Kokoro.