Helix (ヘリックス, Herikkusu?) is a Legion that neighbors Prominence territory. In short story 2, bundled with the eight Blu-Ray volume of the anime, six members are depicted in combat with Prominence, with whom they have done a Territory Battle with every weekend in June. The Legion is based in Itabashi.
Beryllium Coil in particular is lauded as a tactical genius, making the Legion a formidable opponent in battle.