Nanoha: Fate, come with me to the world of gourmet food and help me find some dessert ingredients. Mom's been doing a few too many dessert experiments lately.
Jashin-chan: Aqua! Quick! Hurry and save me! Yurine! Yurine's gone crazy again! Aaaaaah!!
Yukino: Yono-chan! Where's that woman? The starry-eyed woman! I'm absolutely going to teach her a lesson!
Welcome! This is Mochizuki Manor, a place connected to countless worlds.
To move in, all you need is the coordinates of your world and your consent to let everyone visit it.
As the manor's owner, I'll keep everyone in line when they visit other worlds and make sure they don't do anything weird.
A crossover featuring Fairy Tail, High School DxD, Konosuba, and One-Punch Man. More worlds to be decided, and the order is still up in the air.
Maybe I'll include some older anime, too. Feel free to suggest some.