In Mount Fuji Zero Is Found By Zoffy Then Zoffy Adopt Zero As His Grandson And Take Him To His Home Kyoto For Take Care After 6 Year Now Zero Is 5 Year Old So Zoffy Is Take Him To KAIS Elemetry And Middle School In Tokyo For Enrollment Of Zero There Zero Is Meet His New Friends Arale A 4 Year Old Girl And Homeroom Teacher Ume Matsuzaka A 24 Year Old Woman At The First Day Of School Zero Is Shock Everyone By His Knowledge And Strength So Every Club Want To Recruit Zero For Their Club But Zero Is Join A Historical Reasearch Club With Arale