When my son Katsuhiko was seven years old, we got divorced, and he had to leave his home because I lost custody of him. Several years later, after my husband passed away, I returned to our house to take care of Katsuhiko, who was still a student at that time... but he became a shut-in and started skipping school. I couldn't figure out why he stopped going to school, so I struggled every day to bridge the gap between us. During those difficult times, Mr. Matsuda would visit our home, offering me support and encouragement. Little did I know then that he was secretly plotting something against me...

息子の武史が7歳の時に離婚、その際に親権を取られて息子を置いて家を出ることになりました。それから数年後。旦那が他界し、まだ学生の武史を育てる為、家に戻るも引きこもりになっていて…。不登校になった原因も分からず、母と子の溝を埋めるために奮闘する日々。そんな中で、松田先生だけは家庭訪問に来て、私に親身に寄り添ってくれたのです。そして、この時はまだ私は、彼の企みに騙されていたとは知らなかったのです…。