Little Jingu has believed in platypuses for as long as she can remember. Life is tough as she falls victim to bullying, often orchestrated by a teacher who is worshipped by the rest of the class. It seems that she has no friends, but she has a secret weapon in her struggles: she owns the world's largest collection of soft-toy platypuses, which have the ability to come to life at unexpected moments. When her great-grandmother Oto-hime suddenly appears after a long absence, she plots to avenge the victimisation Jingu has received at the teacher's hands. A day of reckoning is at hand.