You are nothing more than a dummy to me

Y/n l/n a 17 year old girl who is a detective and was in training for 2 years. And took French classes for the case. Y/n lives alone in her loving home and is neighbors with the wrights family, and the babysitter and big sister to Yumi wrights a 11 year old girl that has beautiful white hair and red ruby eyes.

But what would happen if one morning y/n hears loud banging next door, and goes to investigate what was happening. But only to find a giant teddy bear chasing yumi and then later both of them are in the basment.

And only to finds a living dummy in there in a black box