Seems at some point, a new student joined the Miyamoto Dojo's kid class. Ciri, a young lioness, seems to want become as big and strong as her cousin Kassandra, and hopes training here will help. Along the way, she befriends the Sensei's son, Kotaro, but also becomes a bit jealous at the comical strength he seems to have, which he treats as normal at this point.

He sees her as little more than a new friend though. Ciri does as well, but also wants to become a match for him.

Kotaro is to me and  jazzanovawolf
Ciri is to  AmerettoShadow32