Isn't he the type of person you should worry about? He got a dangerous "monster" as his first familiar (and got a bit tricked by him) and didn't realize he was making a contract with his second one. What's the next thing he's going to do?
He’s a 3 year old.
not his mind .
There was a time skip he's 5 not 3. Plus, Kokuhaku is incredibly strong so with some guards incognito with him he should have no problems.
they better let him go outside , shouldnt be anything to think about . geez no matter what he still a kid and now he has to powerful allies (⌒▽⌒) no need to worry ....... at all