When my son Takeshi was 7 years old, I got divorced, and at that time, my custody was taken away and I had to leave my son and leave home. A few years later. After her husband passed away, she returned home to raise Takeshi, who is still a student, but became a recluse... Without knowing the reason why she stopped attending school, she struggles every day to bridge the gap between mother and child. In the midst of all this, Professor Matsuda was the only one who came to visit my home and was kind to me. And at that time, I didn't know that I had been fooled by his plan...