Shinchou Yuusha: Kono Yuusha ga Ore Tueee Kuse ni Shinchou Sugiru S01

The goddess Liztart, savior of the world of Giruband, summons a hero to aid in its salvation. The hero, Cia Riovain, has a Chit Rank status, but is ridiculously cautious. For example, he buys three sets of armor, one to wear, one as a spare, and one as a spare for the spare. Beyond keeping a large amount of stored items, he stays in his training room until he reaches the maximum level, and only then goes to battle with the rest, just to be sure.