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A gate to another world opens in Mikado City, and monsters called Neighbors emerge. It's up to Border Defense agent Osamu Mikumo to fight them.
Season 1
73 Episodes
Season 2
12 Episodes
Season 3
14 Episodes
E1 Visitor from the Other World
E2 Neighbor and Trion Soldier
E3 Osamu Mikumo's Ability
E4 Ai Kitora, A-Rank No.5 Agent
E5 Power Elite, Yuichi Jin
E6 Chika Amatori's Side Effect
E7 Miwa Squad's Assault
E8 Black Trigger
E9 The Organization Known as Border
E10 Tamakoma Branch
E11 The Determination of Each One
E12 A-Rank Agents of Tamakoma
E13 Border Top Team
E14 Miwa Corps
E15 Black Trigger Wind Blade
E16 To the Future
E17 Border Official Enlistment
E18 Mikumo Shu VS Kazama Souya
E19 Ranking Battle! Midorikawa Jun's Strategy
E20 Duel! Yuma VS Midorikawa
E21 Neighbor's World
E22 A Large-Scale Invasion Starts
E23 The Holy Land, AftoKrator
E24 Nestling from Mysterious World
E25 Best Force in Border
E26 Fierce Fight! Enedora vs. Kazama Squad
E27 Counterattack of Border
E28 Star Wand Master
E29 Crossroads of Destiny
E30 Enemy Commander High Rain
E31 Mikumo Osamu's Consciousness
E32 Implacable Enedora
E33 The Terror of Hyrein
E34 A Fierce Showdown! The Fight of the Best
E35 The End of the Battle
E36 The Have-not
E37 A Hero and a Partner
E38 B-Rank Wars Begin
E39 Suwa Squad and Arafune Squad
E40 Setting off! Mikumo Squad
E41 An Impertinent Rookie
E42 Ko Murakami of Suzunari-1
E43 Nasu Squad's Choice
E44 The Battle in the Foul Weather
E45 The Thing That Decides the Battle
E46 The Ace's Willpower
E47 The Captain's Pride
E48 And Towards the Future
E49 Fugitives from Another World
E50 Invisible Assailants
E51 Xeno's Trion Soldiers
E52 The Sunset of Meeden
E53 The One that Shall Be Saved
E54 Giev's Thrust
E55 Dead or Alive
E56 The Secret of Lilith
E57 Xeno and Lilith
E58 The Captured Osamu
E59 The Two Black Triggers
E60 The Adventure of Yotaro
E61 Truth and Lies
E62 Giev and Charon
E63 A Reversed Future
E64 A Prisoner from Aftokrator
E65 No.1 Shooter, Masataka Ninomiya
E66 Sharpened Fangs
E67 The Battle of the B-Rank Top Teams
E68 The Targeted Tamakoma
E69 A Battle Royal
E70 A Captain's Duty
E71 A New Threat
E72 An Evolving Mikumo Squad
E73 To the Future
