Keisuke Yuuki

Driven by an intense need to protect his younger sister, Miaka, this devoted older brother initially met her fantastical claims about the Universe of Four Gods with deep skepticism. After witnessing her vanish into the mysterious book firsthand, his doubt turned into a desperate mission. He spends much of the journey studying the ancient text, tirelessly searching for a way to navigate the magical realm and bring his sister safely back to the real world.