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    Introduction Arc:
    Yoneya Yosuke first appeared alongside Shuji Miwa investigating a trion soldier that had appeared in the Forbidden Zone. He remarked that whoever killed the trion soldier had to of been from A-Class.

    Yosuke appeared again, helping Miwa stake out Osamu’s home. Yosuke noted how pumped he was at the idea of fighting a humanoid neighbor, to which Miwa scolded him. Jin Yūichi appeared at that moment with orders from headquarters about an important mission.

    Yosuke and Miwa didn’t allow this to distract them from their watching, as they later caught replica measuring Chika’s level of trion and reported that they had found the humanoid neighbor. He first mistook Chika as the neighbor, but Yuma Kuga stepped in before they could attack.

    When Yuma defended against several shots at point-blank range, Yosuke expressed his surprise and awe. Yosuke wanted to go head-to-head one on one, to which Miwa refused pointblank. Yosuke launched a surprise attack on Yuma, but Yūma dodged most of it. He then asked if he should start with aiming for the feet.

    Yosuke and Miwa forced Yuma into the air, where Narasaka shot off Yuma’s arm. He then tried to goad Yuma into counterattacking. The two continued to fill up Yuma’s time, until Miwa fired several Lead Barrette’s, which weighted down Yuma. Yosuke used this chance to charge in for an attack, only to be caught when Yuma copied Miwa’s attack.

    Kodera ribbed him over being flashily defeated, and Yosuke listened to Jin’s explanation of Yuma having a black trigger. Yosuke then turned off his trion, complaining about how badly he lost, and accepting whatever punishment Yuma might have. He easily answered any of Yuma’s questions, and left happily asking only that Yuma not go easy on him next time.

    Black Trigger Retrieval Arc:
    Yosuke was one of the observers keeping watch on Tamakoma when the top three A-Rank teams returned from the neighbor world's. Yosuke joined the battle against Arashiyama and ordered to dispose of Satori Ken. However, Kitora followed after him, making him break a window.

    The two battled it out in the abandoned apartment, Yosuke doing most of the attacking, with Kitora dodging most of the moves. He failed to notice Kitora setting up trap wires, and she stabbed in the chest when he could no longer move. He dragged her out of the room however with his remaining strength, yelling for Kohei Izumi to take her out. However, he didn’t succeed as Mitsuru Tokieda blocked the bullets at the last moment. He bailed out after that.

    Border Enlistment Arc:
    Yosuke appeared with Yotaro Rindo and Raijinmaru, to say hello to Yuma. He answered Yuma’s question about Miwa’s bad health, and after Miwa left, challenged Yuma to a fight. However they ran into Mikumo being ferociously beat down by Midorikawa Shun. When Yūma challenged Midorikawa to a fight, Yosuke wondered what happened to his fight.

    At the start of Yuma vs. Midorikawa fight, Yotaro asked if Midorikawa or Yosuke was stronger. As he watched the fight, he commentated on it, pointing out how much more experienced Yuma was to Midorikawa. The moment Yuma stepped out of the fighting booth, Yosuke challenged him to a fight, but was interrupted by Jin. He never does get his fight.

    Large-Scale Invasion Arc:
    Yosuke appeared with Midorikawa Shun and Izumi Kohei to help the gathered B-rank teams against Lamvanein. He teased Izumi about Lamvanein being in the same bullet fool community. Izumi called them fodder in reply as he gathered info from Azuma. Yosuke suggested that they study a map, and make a plan.

    As Izumi and Midorikawa provided a cover, Yosuke attacked Lamvanein from the back. Lamvanein managed to dodge the worst of the attack, but Yosuke kept attacking to try to create an opening for Midorikawa to attack. The back attack failed. Yosuke dodged into cover as Lamvanein rained fire from above.

    Under Azuma’s command, Yosuke stood at a broken window, waiting for Lamvanein to target Tatsuya Kuruma. He lept out the window, but Lamvanein abruptly hurtled towards him, firing. Kuruma, Midorikawa, Kotaro Tomoe and Tsuneyuki Okudera created a shield around him, protecting him from Lamvanein’s attack. Yosuke scored a direct hit by stabbing him through the chest.

    Yosuke apologized for being unable to go solo as Moira attempted to backstab him through several small portals. He dodged the attack, and Lamvanein admitted his complete and utter defeat, and hopes to battle again before retreating. Yosuke then complimented Kuruma on pretending to be bait. He followed Izumi into supporting C-rank trainees. Azuma promised to treat him and the other two a-rankers to a meal.

    Yosuke and Midorikawa attacked the two Rabbits chasing C-Rank trainees. Osamu happily greeted them, and Yosuke happily declared how lucky Yuma was for getting to fight a black trigger. They joined the fight, but were unable to hold back all of the Rabbits.

    He saw Osamu borrow Chika’s power to destroy one of the rabbits. When Hairein attacked with his black trigger Alektor, Yosuke was able to block the ‘birds’. However, his weapon was turned into trion cubes. He barely managed to avoid a rabbits follow-up attack, but was injured.

    When Osamu fled, Yosuke warned him that freed-up rabbits were going to attack. He continued to attack the rabbits, and noted Izumi’s attack plan. One of the rabbits he was facing abruptly disappeared when Moira moved it to face the snipers.

    When Kyosuke came to him, Yosuke asked if Kyosuke was using a cheat. Kyosuke asked him to retrieve that agents that were cubified on the street and protect the fleeing C-Rankers. As Kyosuke attacked, Yosuke provided backup and a distraction by tossing rubble at Hairein. Hairein however decided not to stall them any longer, and retreated. Not before attacking Kyosuke one last time from the back as Yosuke looked on, noting the tactic.

    He caught up to the C-Rankers and gathered all of the snipers on the top of a nearby building and ordered them to fire at Hairein on his way to attack Osamu carrying Chika’s cube. As Aftokrator was forced to retreat, he remarked on the skies clearing.

    He retrieved the heavily injured Osamu and got him into the base. He visited Osamu while he was in the hospital and received an Outstanding Service Award.

    Rank Wars Arc:
    He watched the battle between Tamakoma-2, Suwa Unit and Arafune Unit.

 
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World Trigger and related characters are property of Ashihara Daisuke, Toei Animation  and TV Asahi. Layout and contents are ©Miriallia do not steal or reproduce~ All the images I used are from Google.com, if you think they belong to you, just drop me an email, I will credit you~!