Tamakoma First

Tamakoma First, also known as Kizaki Unit, is a Border Team. It is led by Reiji Kizaki. Each member have their own unique Trigger, which is different from HQ's Normal Triggers. They are not allowed to participate in the Rank Battles due to these Triggers being considered too powerful, and being unapproved Neighbor technology. Shinoda also called them "Border's Strongest Unit."

Black Trigger Capture Arc
The members of Tamakoma First are assigned as mentors to Osamu, Yūma, and Chika. They train their pupils in their field.

Large-Scale Invasion Arc
Shinoda sends Tamakoma First to aid Osamu after Kitora is cubified by a Rabbit. It is easily able to deal with the new Trion Warrior, but Hyuse and Viza come along. At this point, the members are forced to split up; Konami chases after Trion Warriors heading towards civilians, Karasuma helps Osamu and Chika flee from the Neighbors while Kizaki faces the two.