Yuzuru Ema/Plot

Background
Ema joined Border approximately one year before Chika Amatori and Yūma Kuga. Mirai Hatohara took him under her wing and became his mentor. He was very fond of her, and praised her skills despite her unwillingness to shoot people directly. She told him about her idea to combine Lightning and Lead Bullet to overcome her aversion, as well as of its impracticality. He began to resent the upper management of the organization when her mental block caused Hatohara to be removed from the away expedition team despite passing the qualification exam, and his loathing only intensified when his mentor supposedly quit due to being sidelined. Since then, he refused to acknowledge anyone else as a mentor. At some point Kageura Unit was formed and climbed to A-rank no. 6, but it was demoted when Kageura threw an uppercut at Eizō Netsuki.

Introduction Arc
Kageura Unit presumably takes part in the extermination of all Rads in Mikado City.

Large-Scale Invasion Arc
Due to Masafumi Shinoda preventing B-rank units with missing members from fighting against Aftokrator's forces out of fear of capture, Kageura Unit was not deployed.

Round Two
Since Azuma Unit, Katori Unit, Ōji Unit and Yuba Unit competed in a four-way rank battle in the day division on February 5, and Ikoma Unit and Ninomiya Unit are known to have clashed on that day, Kageura Unit presumably faced off against them in the night division.

Round Four
He is first seen sniping at a target during Sniper practice. He does not actually hit the target, but instead makes a star shape. Afterwards, Tōma explains that he is Ema's new mentor, but Ema denies this, stating that Hatohara was his only mentor. Chika, knowing of Hatohara's story, then begins a discussion about her with him. During this conversation, she accidentally gives away that she cannot shoot people either. Later, he is seen in Kageura Unit's base watching logs.

During the rank battle, he snipes at Ninomiya to cover for Kitazoe, but his shot is easily blocked. Ninomiya then goes to hunt the two down. While Inukai is pursuing Chika, he and Kageura defeat him together, but Ninomiya attacks Ema. Ninomiya asks why he was supporting Tamakoma Second, but Ema informs him that that was not the case, and that he simply despised Ninomiya Unit. He is forced into a building, where Ninomiya later defeats him.

After the rank battle, he does sniper training with Chika. Seeing how she resembled Hatohara in that they both considered themselves useless, he trains her by teaching her about Lead Bullet, and its combination with Sniper Triggers. He reveals, internally, that he did not want Chika to suffer as Hatohara did due to her perceived uselessness.

Round Five
On February 19, the night of Galopoula's blitz, Kageura Unit fights a rank battle against Azuma Unit and Yuba Unit.

Round Six
Kageura Unit fights against Ninomiya Unit, Azuma Unit and Suzunari First in the night division of the sixth round of rank battles. Kageura Unit and Ninomiya Unit tie at the top with three points. No unit receives the survival bonus due to there being multiple survivors. Following the match, Kageura Unit remains in second place with a point total of 34.

Round Eight
On March 5, Kageura Unit faces off against Ōji Unit and Azuma Unit in the day division of rank battles. Azuma Unit wins the battle, which took place in Exhibition Hall, with a final score of 4-3-3.