Why Does Nobody Remember Me in This World?
Why Does Nobody Remember Me in This World? is a Japanese light novel series written by Kei Sazane with illustrations by Neco. It was published under Media Factory's MF Bunko J imprint from July 2017 to August 2020. A manga adaptation illustrated by Arikan was serialized in Media Factory's Monthly Comic Alive manga magazine from February 2018 to October 2025. An anime television series adaptation produced by Project No.9 aired from July to September 2024.
Plot
A war between five races for supremacy on Earth is won by humanity, led by the hero Sid. Suddenly, history gets overwritten so that Sid never existed, leading to humanity losing and becoming subjugated by the other races. All of this is witnessed by a boy named Kai, who is mysteriously unaffected by the alterations. In this new world, Kai finds that he never existed previously, so no one knows him. After meeting a mysterious girl named Rinne, Kai is inspired to become the hero himself and free humanity.
Characters
;Kai Sakura-Vento
;Rinne
;Jeanne E. Anis
;Ashran Highroll
;Saki Miscotti
;Falin Rina Yubikitasu
;Reiren Reiru Reicherieru
Media
Manga
A manga adaptation illustrated by Arikan was serialized in Media Factory's Monthly Comic Alive manga magazine from February 27, 2018, to October 27, 2025. It has been collected in fourteen volumes as of November 2025. The manga adaptation is published digitally in English on Kadokawa Corporation's BookWalker website.
Anime
In July 2023, during the MF Bunko J Summer School Festival 2023 event, an anime television series adaptation was announced. It is produced by Project No.9 and directed by Tatsuma Minamikawa, with scripts written by Satoru Sugizawa, and characters designed by Hiromi Kato. While the series received an advance screening on June 16, 2024, at the Grand Cinema Sunshine in Ikebukuro, Tokyo, it aired from July 13 to September 28, 2024, on Tokyo MX and other networks. The opening theme song is "Sekai Rinne" performed by Unlucky Morpheus, while the multiple ending theme songs are performed in the following: the first is "Togirenaide" performed by Susu, the second is "Ai, Amnesia" performed by Urbangarde, and the third is "Umbra" performed by Elfensjón. Crunchyroll licensed the series. Medialink licensed the series in East, Southeast Asia and Oceania for streaming on Ani-One Asia's YouTube channel.
Reception
By July 2023, the series had over 700,000 copies in circulation.