Manhole Senki Aoi

A hot-blooded manhole-cover battle manga born from TV Asahi's program "Manga Michi"! The original idea is by Aoi Koga, a voice actress who is a manhole-cover connoisseur! Based on real manhole cover designs from all over Japan, when they turn into monsters, their battles will be fierce! Aoi's never-before-seen battle adventure manga is about to begin!

(Source: Corocoro, translated)