Under Tokyo’s underground railway system is a world called Underground , populated by Elemental Users, people who can manipulate various elements. When the Maiden of Life, Ruri Sarasa, and her bodyguard, Gravity User Chelsea Rorec escape to the surface, they take refuge with swordsman Rumina Asagi and his bespectacled best friend Ginosuke Isuzu. During a battle with the flame-using Seki, Rumina is killed and then resurrected by Ruri. The revived Rumina finds he now has the power to manipulate Wind, a rare talent amongst the Underground people. Realizing Ruri is in danger, Rumina vows to protect her, even if it means going to the Underground to rescue her from her eventual captors before she gets sacrificed.

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