Ep. 1: A portal to another dimension opened in Mikado City, bringing forth alien invaders known as Neighbors.
Aired on October 5, 2014

Roughly four years prior to the current timeline, a dimensional gateway manifested within the boundaries of Mikado City. This breach allowed entities from a separate realm, designated as Neighbors, to enter the human world. These invaders have since become a significant presence in the area, altering the local environment and society. The event marks a pivotal shift in the region's history, introducing supernatural elements into everyday life and establishing a new dynamic between the human inhabitants and the newly arrived beings from the other side.
Episodes
- Ep. 1 · A portal to another dimension opened in Mikado City, bringing forth alien invaders known as Neighbors.
- Ep. 2 · Osamu struggles with Border's enemy designation of Neighbor Yuma as trust develops between them.
- Ep. 3 · Osamu Mikumo Faces Trion Soldiers at His School Near the Forbidden Zone
- Ep. 4 · A-Rank Agent Ai Kitora Questions Osamu's Claim Regarding Marmod
- Ep. 5 · Kitora Jumps onto Ilgar as the Trion Soldier Targets the City