World Trigger (2014)

S1E51 Xeno's Trion Soldiers

As enemy Trion soldiers unleash chaos on Gojima City, Kazama Squad mobilizes for battle. Amid the conflict, Osamu attempts to connect with Zeno and Lilith. Zeno proposes a deal: he'll share the truth about his past—and the secrets of Elgates—if Osamu agrees to a one-on-one duel. How far is Osamu willing to push himself for answers?