Yuuki Tachibana is one of Yogiri's classmates who got dragged into the summoning along with everyone else. He's best known for being a major antagonist in Volume 1, where he leverages his Dominator Class ability—one of the system's top-tier powers—to control and enslave other people, using them both as tools and to boost his own strength. He's also considered a sage candidate, putting him among the more capable people in the group.
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