In a vibrant, bustling metropolis where greetings hold magical powers and the simple act of saying 'hello' can alter reality, you play as Echo, an eccentric detective. After waking up with amnesia and a peculiar ability to hear people's thoughts every time you say 'hello', you find yourself swept into a case involving a missing person, a clandestine greeting society, and a nefarious plot to control the city's greetings. As you unravel clues through quirky conversations and surreal encounters, you'll face off against rivals and form unlikely alliances. Will you master the art of the greeting and uncover the truth behind the mysterious 'Hello Thief' before it's too late?