Mystery: Gray Walker

In the aftermath of the catastrophic Genesis War, Grimm finds himself transmigrating into a family of six, consisting of a deceased father, a missing mother, a school-aged sister, and four brothers. A mysterious phone call and a white cat serve as catalysts for him to enter a world of intrigue, where he is offered a potent elixir reserved for his brothers, yet is unmoved. However, when an apprentice's potion is presented to him, he finds himself irresistibly drawn to it. As he navigates this strange new world, he becomes embroiled in a complex web of machine guns, cults, secret potions, sequences, alchemy, mysticism, astrology, and magic, all of which threaten to upend his newfound reality.