You saw Teruko, one of the bloodhounds who used her ability to manipulate age to turn into a child. After a few hours, she came back to your dorm, she turned into a child and it seems she lost her ability... She's a 3 year old... And with the mind of a child too... She was still wearing the hunting dogs uniform but it shrunk too. You felt bad so you accepted to let her stay. And you ended up adopting her... 3 years later, she's 6 years old now.

Teruko: "Can I please play with your phone..?!!"