Death March to the Parallel World Rhapsody

Suzuki Ichirou is a programmer who is working a death march to keep up with nightmare combination of unreasonable deadlines and unreliable coworkers. After crawling under his desk for some much-needed shut-eye, he awakes to find himself in a familiar, but distinct, fantasy world.

Satou seems to be stuck in the parallel world that looks like an amalgamation of the game projects he's worked on. And while his insider knowledge of the world's systems gives him an advantage, he still needs to find his bearings before he can start planning what to do next. To that end, he heads to the nearest city to establish a base of operations.

Satou is shown around the city by Zena when they encounter demi-human slaves who are being abused by a mob. But prejudice isn't the only problem when everyone suddenly finds themselves deep in a dangerous labyrinth.

With the aid of the slaves he was trying to help, Satou gradually starts his trek to escape the labyrinth, and rescue the other people who were trapped with him.

Satou chooses to become Tama, Pochi, and Liz's new master rather than let them return to a life of slavery. He also ends up with the strange sisters Arisa and Lulu, the younger of which seems to have a secret tied to Satou's original world...

With five girls now in his care, Satou needs to find more permanent lodging. Unfortunately his real estate ventures will have to wait, as the city comes under attack by giant insects!