Death March to the Parallel World Rhapsody (デスマーチからはじまる異世界狂想曲) is a Japanese light novel series written by Hiro Ainana. It began serialization online in 2013 on the user-generated novel publishing website Shōsetsuka ni Narō until it was acquired by Fujimi Shobo. The first volume of the Light Novel was published in March 2014. A manga adaptation by Ayamegumu ran in Age Premium until the magazine ceased publication, and was then transferred to Monthly Dragon Age. Both the light novels and the manga adaptation have been licensed for publication in North America by Yen Press. An anime television series adaptation by Silver Link and Connect aired from January 11 to March 29, 2018. A sequel has been announced.
Plot
Ichiro Suzuki is a 29-year old game programmer who was tasked with fixing several bugs in two MMORPGs his company is preparing for publication. However, he becomes extremely worn out as he is working during the weekend. After taking a nap, he mysteriously wakes up in a parallel world that resembles some of the fantasy RPG worlds he had worked on, as a 15-year old named Satou, later Satou Pendragon, a nickname he uses while running beta tests, and with what looks like the menu screen of the game he was working on appearing before his inner eye.
However, before he can grasp his current situation, an army of lizardmen ambushes him and launches an all-out attack on him.