Reborn as a snake trapped in poisonous wine, the protagonist discovers a system that grants power through devouring others. After escaping the jar by attacking the man who tended it, the snake hides in a nearby residential area, narrowly avoiding capture by villagers and rescue dogs. It begins evolving by hunting, gaining strength and size, but risks exposure crossing a highway. When snake catchers arrive with a huge bounty, the snake fights back, injuring them before seizing a mythical Soulfruit for energy. Despite being shot, it escapes into a lake, only to be rescued by a girl with a special connection to animals, beginning a tenuous alliance amid growing threats.