This Hero Is Invincible But Too Cautious

This Hero Is Invincible But Too Cautious summary:

Lista, a G.o.ddess from the G.o.d’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.