The anime takes place in 2006, and centers on Akio Hoshigami, who due to a leg injury is forced to give up on her dream of being a track-and-field star. Akio and her friend Ayano Umisoe move on to high school together. Amidst new activities and meeting new friends, Akio gradually starts acting like herself again. Then one day Ayano suddenly disappears.

All his life, Yuuya Tenjou has been the subject of resentment and contempt from everyone around him, even from his parents. To make matters worse, his grandfather—the only person who ever showed him affection—suddenly dies, leaving Yuuya truly alone. Despite facing many adversities, Yuuya does what he can to offer kindness to those who need it—but even the most good-natured people can only tolerate so much abuse. Just when he reaches his breaking point, a flicker of hope appears in the form of a hidden door in his bathroom. This door provides two-way access to an abandoned house in another world, where he instantly gains game-like stats and skills. Moreover, the house once belonged to a sage, which gives Yuuya access to remarkable weapons, equipment, and crops with extraordinary effects. With these newfound blessings, the once-undesirable Yuuya may just reach his true potential and become unstoppable.

This is a world where killing and torture are legalized. Sero, a part-time worker at a torture company, enjoys torturing people every day with his senior colleague, Siu. With the addition of new part-timers Mike and Hugh, fun torture life continues! The gap between the at-home, easy-going workplace and the gruesome torture is bound to attract a lot of addicts!