The Water Magician (Manga): Volume 6

The mysterious rift in the dungeon turns out to be a trap! Upon activation, Abel and everyone else down in the dungeon find themselves flung to Layer 40, a level so deep that it’s yet to be explored. Unfortunately for them, it is home to a passel of powerful monsters known as devils, including the most powerful devils of all—demon princes. Just as the situation grows dire, Ryo arrives in the nick of time, crashing his way through the ceiling to face off against the enemy!