Anime Crossover: Post-Apocalyptic Base, Starting with Summoning Ship Girls

The world was submerged by the sea, and Luo Zhen was the last human being.
This is our base, this is the system. Explore the truth of the apocalypse, summon girls to grow stronger, and when we run out of resources, we'll travel to other worlds.
Enterprise: The commander says you can't get into bed, are you going to or not? You'd rather die than not get in.
Frederick the Great: I just came to check if the commander was properly covered up.
Prinz Eugen: Commander, when you see me at night, just say goodnight, instead of...
Luo Zhen: What are you doing here? How did you get in?
A group of ship girls couldn't contain themselves and burst through the door, making a major battle inevitable.
Luo Zhen: Ship girls are very strong, but building a base requires various talents. Are there any other roles?
System: Yes, some brothers have it.
Bulma, Android 18, Tsunade... you name it!