Eh, it's just alright, maybe a little below average. The action is kind of mid, the characters (not including mc) are all really bland and seem to only exist to support the protagonist. They don't really feel like they're actual characters with their own goals, struggles and ideals.
Not to mention, the main character is very off-putting when he acts like a twelve year old one minute and then tries to act like a bad ass the next minute. The author apparently can't decide if he wants to make his character the bad ass Demon King of Hell, or if he wants to make him the human that acts like a cute girl and simply wants to eat good food. That'd be a good story to follow, one of a man stuck between two worlds, but it's obvious that following that specific plotline isn't the author's intention. If anything, it really just seems that the off-putting 'man stuck between worlds' feeling is just a byproduct of bad writing.