In Hentai World as Mira Tsubakihara's Relative Novel

Hikari finds himself transported into a 2D world far more dangerous and chaotic than anticipated. Abandoned by familiar settings like Shuchiin Academy, he instead discovers a bizarre reality where he lodges with Mira Tsubakihara and her friend Kasumi. His surroundings grow increasingly strange: a silver-haired neighbor resembling a Yuki-onna, cryptic neighbors like the self-proclaimed NEET "self-defense force," and rural relatives named Kaiseiri and Sayoko. At school, his class rep Chizuru and homeroom teacher Miwa Shirakawa navigate an oddly populated student body including three gyarus who constantly invite themselves to his home, Sakurajima Miyajima from the Kendo Club, Nanao Akane from Baseball, and the Sakuramiya sisters from Archery. Even the neighboring Sekai Girls' Academy adds to the overwhelming strangeness. Danger lurks at every turn in this corrupt world. Armed with unwavering determination, Hikari faces whatever chaos comes his way, ready to confront the filth surrounding him with decisive action.