This Hero Is Invincible but Too Cautious

Lista, a Goddess from the God’s realm, has a huge task to accomplish. She must save the world Geabrande (with a S-rank difficulty salvation) from evil threats. To perform this task, she summons a hero from Planet Earth called Ryuguuin Seiya. This hero is exceptional and fully capable, but has one major problem: he is unbelievably cautious.