Kei Tachikawa

Among all operatives within Border, Kei Tachikawa stands unchallenged as the number-one ranked attacker and the commanding force behind the organization's premier squad. On the battlefield, he wields dual Kogetsu blades with breathtaking precision and an aggressive tactical mind that keeps opponents perpetually off-balance — all fueled by a deep-seated obsession with combat itself. Yet away from the frontlines, he transforms into a surprisingly average college student who struggles academically and falls for tricks with alarming ease. Regarding Jin Yuichi as his greatest rival, Tachikawa serves as both the ultimate benchmark of strength and a unifying pillar within Border's ranks.