A Mystery about facing oneself. Kazuto Hikaza, a somewhat eccentric ventriloquist, travels across the country to perform puppet shows with a Toy Poodle named Ryoko, whom he calls his "older sister." In appearance, he is extremely handsome, but he is a petty, stingy, and Dry man. Such a Kazuto encounters a boy and his mother, Kyoko, in the tourist spot "Onomichi" overlooking the beautiful bridges of the "Shimanami Kaidou" in the Seto Inland Sea, and finds himself facing a certain incident. He challenges the cases he encounters wherever he goes using a unique method of thinking. It is a Mystery work where he also faces the mysteries he himself harbors.