The story focuses on the 16-year-old Protagonist after he is transferred to Shujin High School in Tokyo. Staying with friends of his parents, he meets up with two fellow students, problem child Ryuuji Sakamoto and withdrawn An Takamaki, and a talking, shape-shifting cat-like creature known as Morgana. During his time there, feeling suppressed by their environment, the four form a group known as the "Phantom Thieves," working together to carry out heists and encountering mysterious phenomena along the way.