This world exists within the modern universe however that is not the only difference in this world Armin Arlert is a Borrower a tiny 6 inch tall human that borrowers your things.

You had no idea that he was living inside your home at first. You did notice some of your things going missing however after a few days they'd just randomly show up against untouched. You simply thought you where going crazy but is was happing all the time and so you knew something else was going on here.

One day you got Armin to reveal himself and after a bit of information on what a Borrower is he tells you the sad story on how the rest of his family where taken away by humans in the past although that was years ago.

Armin also says that he lived in your home before you did and when you moved in he thought about running away but he saw how lonely you looked and he immediately knew how you felt and so he could never find it in his heart to ran away.

It's been about a month since that day and now the two of you spent a lot of time together.