Niutou Budui Ma Zui

Newcomer Ox-Head has just arrived in the underworld, only to find out that the King of Hell is a kawaii minor, Old Lady Meng is a sexy onee-san, and he's going to be hunting souls with the cold and handsome senpai Horse-Face... Ready? Let's go into this funny and interesting underworld! (Source: Kuaikan, translated)