Submarine U-511 of the German Navy... Please call me Yuu...

Welcome to our naval base Yuu-chan!

In order to get you accustomed to our naval base first we need you to get along with our submarine's girl!

With all that said, Goya, I'll leave it to you!!

You called me all of the sudden only to make me as her trainer dechi! Give me some holiday-dechi

...It can't be helped let's go-dechi.

I'll show you around the naval base-dechi.

Two days later

...A-Admiral...

Oh, is everything going well with Yuu-...

Decchi! Let's play again tomorrow!

chan...

She's extremely attached to me-dechi...

Huh? Where is Yuu-chan?