Iro and Emil have opened their first Gates, unlocked new talents, and proved the fleet's Hoppers aren't stalled. Despite leaving the rank of trainee, they find their training is just beginning.Thrown into a new squad with an explosive Mage, a cursed Surveyor, and a Vanguard with shady motives, Iro and Emil will delve deeper into the titan than ever before. There are bizarre things in the depths; pitch black oceans, nests of swarming monsters, and Spires that rip through the hull of the titan. But what purpose do the Spires serve and can Iro and Emil reach the top in time?