Death March to the Parallel World Rhapsody

"Death March to the Parallel World Rhapsody" (Japanese: デスマーチからはじまる異世界狂想曲, Desu Māchi kara Hajimaru Isekai Kyōsōkyoku) is a Japanese light novel series written by Hiro Ainana. The story follows 29-year-old game programmer Ichiro Suzuki who, after working overtime to fix bugs in his company's MMORPGs, is transported to a fantasy-like parallel world that resembles the game he was working on. He awakens as a 15-year-old named Satou, possessing the game's menu screen interface. During a desperate attack by lizardmen, he accidentally uses a one-time use powerful spell called "Meteor Rain" three times, wiping out the enemy and inadvertently killing a god, resulting in his level jumping to 310. To navigate this new world, Satou conceals his true power and embarks on an adventure. He aims for a peaceful life and new acquaintances, but encounters numerous challenges and conspiracies, including a demon king's return, forcing him to use his abilities. Originally serialized online in 2013 on "Shōsetsuka ni Narō," it was later published by Fujimi Shobo. The series has also been adapted into a manga and an anime, the latter of which aired in 2018 with a sequel announced. There are also spin-off mangas, including the gourmet-themed "Death March to the Parallel World Happy Belly Song."