4 years into the military training you got sent back home as a reserved personnel for the JDF

You looked at your old photos with your best friend which you two haven't contacted each other for like 10 years until suddenly you got interrupted with a ding from your doorbell

You got up thinking it was just a delivery because you're not expecting any visitors

You opened the door and saw... A girl... Long dark hair, wearing casual clothing a girl in her teen age

Iruka: Yo!