The Black Hole
Summary: there's a legend about a black hole that connects different universes. This black hole once connected six universes together and brought the six young heroes and their most trusted partner together.
One universe the black hole connected to has the world of a young ninja jinchuuriki called Naruto Uzumaki and his most trusted partner Sakura Haruno.
The second universe the black hole connected to has the world of the pirate that causes mass destruction yet is the kindest of them all Monkey D. Luffy and his most trusted partner the cat bugler Nami.
The third universe the black hole connected to has the world of the young dragon slayer called Natsu Dragneel and his most trusted partner the celestial wizard Lucy Heartfilia.
The fourth universe the black hole connected to is the world of the young substitute shinigami called Ichigo Kurosaki and his most trusted partner Rukia Kuchiki.
The last universe the black hole connected to was the world of the famous little detective Conan Edogawa and his most trusted partner Ran Mouri.
The universe that this ten heros were thrown in was the universe of Allen Walker and Lenalee lee .