Tokyo Underground, Volume 2: Irruption

Rumina realizes he cannot rescue Ruri, the Maiden of Life, at his current skill level so he undergoes strenuous training to acquires the powerful "Gale Force Wind" attack. Chelsea and Ginnosuke then join Rumina to assault the Underground world, but upon opening the Pandora's Box, they land in a quagmire of monstrous creatures and bloodthirsty evil forces within the gloomy darkness!