Spring to that Spring! Mouse Kirumin Blues!?
Ken can't transform into a Kirubara like Rico and the others, and eventually he can't even transform into a mouse anymore. Everyone's encouragement has no effect on him, and he finally declares that he will return the Kirumin to Riko... and quit the Kirumins! Rico and the others are shocked, but still head to the shrine again to try to solve the mystery of the monsters. Ken, on the other hand, is invited by Kanon to her house, and when they are alone, Kanon finally...!
Aired 12/07/2010EP 40 - Spring to that Spring! Mouse Kirumin Blues!?
Anyamal Tantei Kiruminzoo
While searching for a run-away cat the twins Riko and Rimu Mikogami find a strange device that transforms them into "Kirumin". It also enables them to turn into real animals. Their older sister Nagisa soon joins them. Now the three have cute, funny and sometimes dangerous adventures.