|“||Ah... I don't think that there'll be any problem.||”|
|Tamakoma Second vs. Yoshizato Unit vs. Mamiya Unit|
|Commentary|| Osamu Mikumo,|
|Next||Tamakoma Second vs. Suwa Unit vs. Arafune Unit|
Tamakoma Second was formed with Osamu Mikumo as captain and put into B-Rank, at #21. This would be their first Rank Battle. As Osamu was still healing from his wounds, he didn't participate in the battle and instead watched as a commentator.
With their first victory, Mikumo Unit is immediately sent to the middle group.
|Introduction Arc||First Large-Scale Invasion • Rad Infestation|
|Black Trigger Capture Arc|
|Border Enlistment Arc||Border Member Official Enlistment Day|
|Large-Scale Invasion Arc||Aftokrator's Invasion|
|B-Class Rank Battles Arc||Galopoula's Invasion|