The Hero Is Overpowered but Overly Cautious, Vol. 7 (light novel)

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Feeling ill-prepared for the looming battle against Mash the Dragon King, Seiya returns to the underworld to acquire some new skills. But every boon gained from this dark realm comes at a cost. While Seiya practices a stealth ability, Rista turns invisible! As he hones the power of darkness, disaster strikes! Will Seiya be able to master these new techniques before the drawbacks wipe out his party?!