Mitsuru Tokieda/Plot

Introduction Arc
Tokieda appears alongside Jun Arashiyama and Kitora Ai when a trion soldier is reported at Osamu Mikumo’s school. As Jun and Kitora talk with Osamu and Yūma Kuga, Tokieda investigates the scene. When Kitora protests leaving, he reminds her that Osamu’s punishment is out of their hands. When the reason behind the unstable portals is discovered, he reappears alongside the rest of his team for cleanup purposes.

Black Trigger Retrieval Arc
Tokieda appears alongside the rest of Arashiyama Unit’s acting on Director Shinoda’s orders to help Tamakoma’s branch. They separate from Jin Yūichi to face Shūji Miwa, Kōhei Izumi, and Yōsuke Yoneya. He and Jun remain on the ground facing Miwa and Izumi, as Kitora and Yoneya battle it out over Ken Satori’s head. Arashiyama says they shouldn’t mess up their own jobs, to which Tokieda agrees. Izumi attempts to shoot Arashiyama, but Tokieda blocks it with Shield. Arashiyama teleports, and together they provide crossfire on Izumi. When Kitora is dragged out of the building to be killed off by Izumi, Tokieda uses his shield to block the majority of the shots. Isami Tōma]] shoots him in the head. Tokieda grabs onto Kitora, dragging her down a little faster, pulling her away from Tōma’s followup shot. Tokieda apologizes to Arashiyama about going out so fast, before bailing out.

Border Enlistment Arc
Tokieda is shown with the rest of his team for the introduction to enlisting in Border. He explains to Yūma about joint trainings and rank battles.

Large-Scale Invasion Arc
Tokieda and Arashiyama open fire on an injured Rabbit cubifying Chano Unit. Yūma thanks Tokieda for the help, to which Tokieda responds by inquiring about his appearance. He observes the bombing run on headquarters. He, Ken Satori, Arashiyama, and Yūma focus on eliminating trion soldiers in the danger zone. After Yūma leeaves, he continues to focus on eliminating the trion soldiers.

Tokieda and his team receive the Outstanding Service Reward.

B-Rank Rank Battles Arc
He, Arashiyama, and Kitora watch the rank battle between Suwa Unit, Arafune Unit, and Tamakoma-2.