Cautious Hero: The Hero Is Overpowered but Overly Cautious

The goddess Rista summons a new hero to help her face the "hard" mode of her video game-like world. This hero, Seiya, excels in every area, but he has one flaw: he's far too cautious! Rista will thus have to deal with a companion who, for example, buys three suits of armor (one to wear, one spare, and one spare for the spare)... or who uses all his power and best attacks to kill silly little slimes!