The Hero Is Overpowered but Overly Cautious, Vol. 1 (manga)

Can a neurotically overprepared hero and an underachieving goddess save a parallel world together?! When the inexperienced goddess Ristarte is tasked with the daunting mission of saving the S-ranked world Gaeabrande, she thinks that summoning Seiya Ryuuguuin, a Japanese teenager who has utterly broken stats as a Hero, will finally turn her luck around. Seiya s abilities (and good looks) are all she has ever dreamed of, but she soon wishes she had read the fine print about his overly cautious personality...