Level 1 kara Hajimaru Shoukan Musou: Ore dake Tsukaeru Ura Dungeon de, Subete no Tenseisha wo Bucchigiru  

Following the loss of his father in a devastating incident, Shinobu Iijima and his younger sister Megumi are welcomed into the home of their father's friend, Ayumu. Despite their grief, Shinobu remains determined to build a new life for himself. Megumi and La Vita Online serve as sources of comfort for him during this challenging time. One day, Ayumu reveals that he has sinister intentions towards Shinobu and Megumi. Just as Shinobu discovers that Ayumu has erased all of his data from La Vita Online, their apartment catches fire, causing Shinobu to fall to his death along with Megumi. He wakes up in a new world...and finds out that he has been reincarnated into La Vita Online. An announcement from the game developers informs him that Ayumu is already present in this world, and a countdown is underway for Megumi's arrival. Driven by a desire to protect Megumi at all costs, even if it means starting over from level one, Shinobu vows to confront Ayumu and defend Megumi when she arrives.

Level 1 kara Hajimaru Shoukan Musou: Ore dake Tsukaeru Ura Dungeon de, Subete no Tenseisha wo Bucchigiru has been published digitally in English as The Invincible Summoner Who Crawled Up from Level 1: Wrecking Reincarnators with My Hidden Dungeon by J-Novel Club since June 5, 2024.