Yuzuru Ema/Plot

History
His former mentor was Hatohara. He was very fond of her, and praised her skills despite her lack of will to shoot people directly. After her apparent dismissal from Border, he refused to acknowledge anyone else as a mentor.

B-Class Rank Battles Arc
He is first seen sniping at a target during Sniper practice. He does not actually hit the target, but instead makes a shape, like Tōma. After, Tōma explains that he was 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, something which he awkwardly points out. 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.