WADAPEN

Echizen a game developer known to make the hardest game to the point they were difficult to complete earning him the title “God Trapper“. However he quits the company when he isnt allowed to do what he does best build traps. Suddenly is iseakied! Now he gains the power from the Demon king’s daughter to become a true God Trapper and nobody can clear his Traps and thus his journey begins with the girl in Hell which happens to be his Heaven

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!

"Headphone," Japan world class audio item. Nene-chan the girl had came across headphones by a chance. From here on she start her road to become a headphone maniac.