WW2 Firefighter giving Hilda some depressing facts

First of all, sorry for anyone being uncomfortable of my past posts, you know, controversial Officer stuffs. The reason why is because of 1 thing, humanizing the enemy. (1 scene of The Long Long Holiday inspired me)

Anyways, so I have this fanfic idea that as of now is this.

A ww2 german firefighter, he is not in a good mental state. Missing the good old days of his childhood. Despite having a loving wife taking care of him, coworkers and personal stuffs, this sadness didn't leave away. Until in 1943, a normal day for his ordinary job, then a storm comes and he forced to take shelter on an abandoned mine. But when the storm stops he exits the abandoned mine and then he's in a forest?! Little did he know, he is in a different timeline, more specifically, the Hilda universe.

Basically, this is where he spend 2 years in. Gradually having his mental state improved and feeling that joy once again. Also mentoring Hilda (maybe her friends too) on life.

Btw, the firefighter belongs in our timeline.