It began serialization online in 2013 on the user-generated novel publishing website Shōsetsuka ni Narō until it was acquired by Fujimi Shobo.

An anime television series adaptation by Silver Link and Connect aired from January 11 to March 29, 2018.

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.

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.

[12] Ayamegumu began serializing a manga adaptation in Fujimi Shobo's Age Premium magazine in December 2014.

[12] Akira Segami launched a prequel manga, titled Death March to the Parallel World Rhapsody Ex: Princess Arisa's Otherworldly Struggle (デスマーチからはじまる異世界狂想曲 Ex アリサ王女の異世界奮闘記, Death March Kara Hajimaru Isekai Kyōsōkyoku EX: Arisa Ōjo no Isekai Funtōki), adapted from the short story by the same name in Death March to the Parallel World Rhapsody: Ex,[37] in Fujimi Shobo's shōnen manga magazine Monthly Dragon Age on February 9, 2018.

[114] The television series is directed by Shin Oonuma at Silver Link and Connect with scripts written by Kento Shimoyama, while Shoko Takimoto designed the characters.