Echizen is a game designer being ground under the boot of his high-pressure job. His demanding workplace won't even let him do what he's best at: building brutal puzzles and traps for players. When he quits his job, something suddenly sucks him into a hellish dungeon in another world. His path collides with the alluring demon princess Sophilia, but before she can explain how or why she's summoned him, they're threatened by a party of marauding heroes--and Echizen watches in horror as the 'heroes' enact a genocidal massacre on Sophilia's demon friends. With his life on the line, Echizen uses the world's magic to put his game developer skills to use in Sophilia's defense. The deadly traps he creates give the heroes some brutal comeuppance, but the rush of power unlocks Echizen's most sadistic impulses...leading him down a path he may never be able to turn back from.

BLASTED TO SMITHEREENS! Through the masterful use of his trap powers, Souta has managed to protect Princess Sophie and her band of monstrous friends from the savage heroes out for their heads. That is until the Royal Hero's Army shows up and vaporizes their humble dungeon abode off the face of the realm with a magical blast! Now fully aware of the immense power gap between the demons he's protecting and the genocidal heroes he's up against, can Souta escape, or will he be...trapped?!

In this dark fantasy isekai story, revenge is a dish best served over and over. Echizen is a game designer who is ground under the boot of a high-pressure corporate job. They don't respect him enough to let him do what he's best at: building brutal puzzles and traps for players. But after he's sucked into another world, his overlooked skills will come in handy! Stranded in a hellish dungeon and threatened by marauding heroes, Echizen finds himself siding with Sophilia, an alluring demon princess. Using the world's magic, he puts his game developer talent to use in her defense in this sadistic tale of brutal comeuppance!