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

The world is submerged by the sea, and Luo Zhen is the last human. This is the base, this is the system. Explore the truth of the apocalypse, summon girls to develop and grow stronger, and when resources run out, travel to other worlds. Enterprise: The Commander doesn't let you get under the covers, are you going to or not? You're going to get under the covers even if you die. Frederick the Great: I just came to check if the Commander is properly covered up. Prinz Eugen: Commander, when you see me at night, just say goodnight, not... 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, a great battle was inevitable. Luo Zhen: Ship girls are strong, but building a base requires various talents, are there any other roles? System: Yes, bro, yes. Bulma, Android 18, Tsunade... you name it!