Shido has barred the Shadow Operatives from action for two years. But when the Phantom Thieves appear, Mitsuru decides that they have to take action. Luckily, there's a certain former member Shido doesn't seem to be aware of: Ken Amada. But when Ken meets the Phantom Thieves in person, he can't help but agree with their goals. He can't help but befriend them. Phantom Thief!Ken AU.