The Eminence in Shadow, Vol. 5 (manga)

In the depths of the Sanctuary, where ancient memories of mighty warriors slumber, Shadow Garden lays bare the long-hidden truth behind the demon Diablos and the hero Olivier—all very critical plot information that Cid pays zero attention to because it’s time for the semiannual Bushin Festival! Playing the part of a weak-looking guy who’s actually super-strong is Cid’s raison d’être, and where better to strut his stuff than a tournament arc?