Taken from mangaupdates:
Neuro is a Being from the underworld , who likes to eat "riddles" and "mysteries" and since he had heard that mysteries abound in the world above , he comes surface side in search of the ultimate riddle capable of satisfying his insatiable hunger
He arrives in front of yako katsuragi whose father has been murdered , and smells a tasty riddle ... and in turn helps her
Neuro forces yako to be his guide and they together go in search of riddles to solve.
I read the 1st chapter and it seemed pretty good manga. Have to wait for more chapters to really tell is it good or not. Art was ok. nothing bad and nothing rly awesome.