"On that day, a miraculous event struck the ‘most unlucky man in the world.’" Fukutaro Kamisaki's life had always been abandoned by luck. Far from happiness, constantly used by his companions, he was ultimately cursed by an evil god with the worst "Disaster Skill." However, due to the effect of this Disaster Skill: Grand Reversal, all of his stats were completely flipped — and only his "Luck" skyrocketed to an insane level. In an instant, he became the adventurer with the highest luck stat in the world, and now, together with a down-on-her-luck goddess, he takes on the divine trials created by the gods — the dungeons!

Touji Nanase, the protagonist, is constantly harassed by debt collectors and bullied at his black company job. One day, he is sucked into a dungeon and attacked by monsters! On the brink of death, he awakens a legendary skill from an item he acquires: the ability to turn the monsters he kills into a sword, known as "Magic Sword User." Despite his gruesome appearance and brutal nature that cause people to treat him as a monster, Touji begins his journey of revenge, targeting those who have tormented him. This is a dark fantasy of revenge and rampaging power, where he fights his way through a world of treachery and betrayal! **A story of vengeance and redemption in a thrilling, dark fantasy world!**

One day, the entirety of the Earth was suddenly reborn into a parallel universe, and everything outside of the planet became known as "the other space". In that parallel universe, there is a three-person group that operates a general store called the "This-and-That Shop", where they spendidly solve the requests and cases that people in trouble bring to them!

"Flag-chan" is an apprentice shinigami, training to collect people's lives in the form of death flags! But, she's a big softie and never ends up collecting any souls. Don't give up, Flag-chan!