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) "R...