Monster Prince and Nessie in action
Monster Prince and young Nessie in action, from the beginning of the series with the first group of hostile aliens. That man is the boy's father who thought his son, one of twins, had died 10 years ago. By the end of the series Nessie will have reached adulthood and be able to take on larger monsters and the boy will have gotten a haircut. Also the Japanese military will get better at dealing with the aliens.