Anyamal Tantei Kiruminzoo episode 40

It aired on Monday, 12 July 2010.

Run to the fountain! Kiruminburusu rat?

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...!