* Based on an adventure science fiction manga by Ashihara Daisuke. One day, a gate to another world opened in Mikado City. Invaders from another dimension, referred to thereafter as Neighbors, overran the area around the gate, leaving the city gripped by fear. However, a mysterious group suddenly appeared and repelled the Neighbors. This Border Defense Agency independently researches Neighbor technology and fights to protect this world. In a short time, they managed to build an enormous base and prepare a defensive system against the Neighbors. it's been four years since then. Source: crunchyroll
Theoretical best: JPN BD+CR
Kitsune and SubsPlease are CR WEB-DLs, the former with better audio and dub The JPN BD is the only watchable video, WEB is very bad and the 7³ACG encode used in multiple muxes is utterly abysmal
Comparisons: slow.pics