Aesthetica of a Rogue Hero

"Aesthetica of a Rogue Hero" (Japanese: はぐれ勇者の鬼畜美学, Hagure Yūsha no Esutetika) is a Japanese light novel series written by Tetsuto Uesu. The story revolves around the phenomenon of "Samon Syndrome", where young people are transported to fantasy worlds and some return with special abilities. The protagonist, Akatsuki Ousawa, known as the "Rogue Hero," returns from the world of Alayzard with Miu, the daughter of the Demon King he defeated. To conceal her identity, he introduces her as his younger sister. They enroll at Babel, a school for interdimensional travelers, which appears to train them for the benefit of humanity, yet its real purpose is unclear. Akatsuki and Miu must confront a hostile student council while uncovering the mysteries behind Babel. The series has been adapted into anime, manga, and audio drama, gaining significant popularity.