Ep. 18: The group investigates Yomijima to uncover Arbornine secrets while Minashi recalls past trauma.
Aired on August 19, 2014

18
Suzaki, Akashi, and others travel secretly to Yomijima to research the Arbornine secret that stops Necrometal infection. This island is where Minashi and two girls were born. As they explore, Minashi is overwhelmed by memories of a massacre at the ruined IX laboratory. Natsuiri arrives on the island after chasing the group. Natsuiri brings the very first MA-Vess. The group faces this new threat while dealing with Minashi's traumatic recollections. The investigation into the Arbornine continues amidst the danger posed by Natsuiri and the MA-Vess. The events on Yomijima connect the past massacre to the current Necrometal crisis.
Episodes
- Ep. 14 · Akashi Saginuma's Disappearance and Mahmu's Decision to Pilot Sable
- Ep. 15 · The Morning Gray Vacant Heart
- Ep. 16 · Past connections reveal Lightless Realm origins as IX faces Admonition attacks
- Ep. 17 · Akashi confronts the revived Corpse while remembering his past sins in the Lightless Realm.
- Ep. 18 · The group investigates Yomijima to uncover Arbornine secrets while Minashi recalls past trauma.
- Ep. 19 · Natsuiri battles regrets while Necrometal consumes him as Akashi reunites with Minashi.
- Ep. 20 · Kasane investigates the abandoned hospital while Suzaki assumes command of Akashi's group.
- Ep. 21 · You Will, to the Birth Cry of the End
- Ep. 22 · Minashi defies orders to reach Tsugumi while the Lightless Realm expands around the IX tower.