Before moving to Matsumoto, Nagano, Kakeru and his mother lived in Tokyo. On April 6th, the day of her son's entrance ceremony, she asked Kakeru to come straight home after school to go to the doctor with her. Even before moving, she had been sickly. She wanted him to come to her new hospital with him. Later, he texted that he couldn't make it. She never replied, and soon after committed suicide.
Kakeru's mother seemed to be emotionally unstable and very reliant on her son. Because of this, she commits suicide. Before her death, she asked her son to promise not to join any clubs.