KONO Tsuranori 
D-Genesis: Three Years after the Dungeons Appeared Volume 5 [EPUB ebook] 

Enter the Phantom! Keigo and Miyoshi encounter new friends, new foes, and new financial woes. Following their momentous press conference and the announcement of their dungeon boot camp, D-Powers begins attracting attention from across the globe. To preserve Keigo’s anonymity, Miyoshi suggests donning a certain costume for some undercover explorer work. Plus, could one of D-Powers’ new recruits be a diamond in the rough? Does a heart of gold beat beneath Keigo’s aloof exterior? New discoveries regarding the dungeons’ mechanics and origins continue to pile up. Whoever this Phantom is, he won’t stop until his undead foes draw their last unbreath!