Tokyo Underground is a manga series by Akinobu Uraka and published by Enix. It became an anime series, produced by Studio Pierrot and shown on the TV Tokyo Network from April 2 until September 24, 2002. The TV series was released on DVD by Geneon Entertainment in the US and Canada, released as a boxset by Manga Entertainment in the UK and by Tokyo Night Train in Australia.
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 Ginnosuke 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 air, 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.
Rumina eventually goes to the Underground with Chelsea and Ginosuke after Ruri is kidnapped. As soon as they arrive they encounter a genetic experiment from The Company but manage to escape.Warning: Spoilers ahead!