Shinjurou Yuuki is known as the "Last Great Detective" but others dismiss him as the "Defeated Detective". However, his love for solving mysteries and his talent has made him a target for dark forces that lurk in the underworld of future Tokyo. Even law enforcement is not entirely supportive of him, making his situation dangerous. However, with the help of his capable partner Inga, Yuuki is determined to uncover the secrets that have been hidden from him. Brace yourself for an intense battle of wits as UN-GO pits mind against matter in a cloak-and-dagger adventure.