Kazuo just starts his career as a teacher. He works hard, and gradually becomes close to female students. One day, he has acute pain and is taken to hospital. After the medical checkup, he is diagnosed with incurable cancer. "I don't wanna be forgotten," he thinks. "I just wanna leave a proof of my life." He decides to leave a mark on each girl to prove his life. He sneaks out of the hospital, and heads for the girls....