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.

There's no such thing as too much preparation! The fate of the S-ranked world Gaeabrande rests with the novice goddess Ristarte. As she thumbs through the piles of duller-than-dull résumés for potential Heroes to summon, she hits the jackpot with Seiya Ryuuguuin, whose stats are so high for a level-1 Hero that he's practically cheating! (He's also pretty easy on the eyes.) But there's a catch. Seiya is cautious to a fault. If he goes to a weapons and armor shop, he asks for three sets of armor: one to wear, a spare, and a spare for the spare. Just in case. He always buys ridiculous amounts of supplies, trains like he's racing to max level, and won't hesitate to use his strongest skills even on a simple slime. With a Hero like Seiya on the job, which will run out first-the Demon Lord's forces or Ristarte's sanity...? The tale of the overpowered yet overly cautious Hero and the goddess who can't decide if she wants to kiss him or smack him begins!

Ristarte summons a hero who excels in every area to assist her. He's everything she expected him to be except for one, tiny thing: this anxious hero can't do anything unless he's absolutely sure nothing can go wrong! The manga adaptation of the break-out hit is finally here!

I’M SORRY. Feeling ill-prepared for the looming battle against his former pupil, Seiya returns to the underworld to acquire some new skills. But every boon gained from this realm comes at a cost—Rista’s dignity. First, his group hones their stealth abilities by learning invisibility magic. Then, Seiya ventures to the Infinite Corridor to harness the powers of darkness! They’ll need more than a couple new tricks to defeat Mash, the Dragon Lord, though. To gain an edge in the fight to come, they will have to peer into the past and learn the tragic origins of Warped Gaeabrande…

The invasion of a malevolent deity has brought the spirit world to its knees! Rista falls unconscious amid the turmoil, and when she next opens her eyes, she finds herself in a distorted version of Gaeabrande. Here, humans and demons have joined forces against a much greater foe, forging alliances as bizarre as Rosalie Roseguard and Chaos Machina! Nothing makes sense anymore, so why not double down on the madness? In order to save the spirit world, Seiya is summoned once again, and this time, his base of operations will be...the underworld!

WHAT COULD HAVE BEEN...Beast Emperor Grandleon, Machine Emperor Oxerio, and Vengeful EmpressCelemonic have all been defeated by the cautious Hero. As Seiya, Rista, Kiriko, andJonde travel to the west to face the Death Emperor, the last of the Demon Lord'sgenerals, though, they are wholly unprepared for what they fifind: a town full ofhappy people, all living peaceful lives. And why wouldn't they be? Accordingto them, the Demon Lord was defeated over a year ago by none other thanSeiya Ryuuguuin himself! As the party's heads flflood with questions, a familiarsilhouette appears on the horizon...

Well, this probably isn't the kind of homecoming anyone expected... After saving the Gaeabrande, Seiya and Rista are rewarded (or punished) with a one-way trip to Ixphoria. Due to their failure to save the B-rank world in the past, the baddies have leveled up and plunged Ixphoria into chaos, transforming it into an SS-Ranked Hellscape! And just when it seemed like things couldn't get any worse, Seiya falls victim to a class-changing curse! Now the Overly-Cautious Hero must save this impossibly difficult realm as...a playful piper...?

Does the "Cautious Hero" have a plan for taking on General Deathmagla's army?! The misadventures continue of Seiya, the absurdly overcautious hero who tried to buy a thousand bottles of holy water as soon as he knew he'd be fighting undead, and Rista, a goddess who's always waving her literally "holier-than-thou" attitude in his face! Things start off badly when Seiya immediately butts heads with the dragonkin who were supposed to become his allies-and does he have a plan for dealing with the army of ten thousand undead approaching the town?!

Is it time for Seiya’s bag carriers to fulfill their destinies?! Seiya probably doesn’t need to get any stronger, seeing as he just took apart a seemingly invincible monster with his bare hands, but you can never be too careful! This time, he’s headed to Dragon Village-along with Rista and his bag carriers, Mash and Elulu-to acquire the holy sword Igzasion. The ultimate weapon is surely a must-have for anyone as pathologically overprepared as Seiya, but what will he have to sacrifice in exchange...?

Robots versus Golems!Rampaging past his limits in his new Berserk Mode, Seiya emerges victorious from the battle with the Beast Emperor, Grandleon! But his struggles in the revamped world of Ixphoria have only just begun...Next on the chopping block is the Machine Emperor, Oxerio. His high-tech arsenal, replete with tens of thousands of killing machines, threatens to wipe Termine Kingdom off the map! Fortunately, Seiya’s got a secret weapon! ...Sort of.