The Eminence in Shadow Vol. 6 by Daisuke Aizawa

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Having successfully entered the Bushin Festival in disguise, the stage is set for Cid to enact his master plan and fulfill his long-cherished dream—to be a mysterious weakling who shows up at a tournament and everyone goes “Hold up, that idiot’s gonna get himself killed!”, but then he’s actually super-strong and the crowd’s like “Wow, who is that guy!?”