A bored Rimuru Tempest accompanies Diablo when he goes to meet with an old friend in the Netherworld. What will happen when he meets an out-of-place human boy who piques his interest? (Tensei Shitara Slime Datta Ken and Mairimashita Iruma-kun crossover)

"Hey, Ciel I'm bored, what should I do?"(Rimuru) "I suggest that you try going to another universe like one of those anime you watched"(Ciel) "Okay let's go now before Shuna traps me with paperwork!" "Rimuru-sama here's another stack!"(Shuna) (I suggest you go now if you don't want to be stuck here for years"(Ciel) "Runnnnn!!!"(Rimuru) Follow the tales of Rimuru Tempest as he messes up the Naruto world! Warning OOC Rimuru!