A sheet-shaped system, comprising: a wiring sheet, comprising: one or more carbon wires that are conductors including carbon as a main material and have flexibility, each of the one or more carbon wires being one of a signal line and a power supply line; and an insulation sheet that encloses an entirety of the one or more carbon wires, includes an electrical insulator as a main material, and has flexibility, a plurality of vias that extends from a surface of the insulation sheet to the carbon wires; a plurality of metal terminals disposed on the surface of the insulation sheet; wherein the one or more carbon wires include three or more carbon wires, the three or more carbon wires include the power supply line, the signal line, and a first GND line, and in the insulation sheet, the power supply line, the signal line, and the first GND line are arranged in a direction in which the insulation sheet extends two-dimensionally and extend in parallel to each other, and the signal line is positioned between the power supply line and the first GND line, wherein the metal terminals and the three or more carbon wires are electrically connected by penetrating through a surface of the insulation sheet to the three or more carbon wires, and a plurality of loads that are electrically connected to the one or more carbon wires from an outside of the insulation sheet, and the plurality of loads each include: a power storage element configured to receive and store a supply of power from the power supply line; and an electric circuit configured to receive a supply of power from the power storage element to operate intermittently, and the plurality of loads each include an electric circuit configured to return power stored in the power storage element to the power supply line wherein the electric circuit includes a sensor and is configured to output, via the signal line, a physical quantity measured by the sensor. a wiring sheet, comprising: one or more carbon wires that are conductors including carbon as a main material and have flexibility, each of the one or more carbon wires being one of a signal line and a power supply line; and an insulation sheet that encloses an entirety of the one or more carbon wires, includes an electrical insulator as a main material, and has flexibility, a plurality of vias that extends from a surface of the insulation sheet to the carbon wires; a plurality of metal terminals disposed on the surface of the insulation sheet; wherein the one or more carbon wires include three or more carbon wires, the three or more carbon wires include the power supply line, the signal line, and a first GND line, and in the insulation sheet, the power supply line, the signal line, and the first GND line are arranged in a direction in which the insulation sheet extends two-dimensionally and extend in parallel to each other, and the signal line is positioned between the power supply line and the first GND line, wherein the metal terminals and the three or more carbon wires are electrically connected by penetrating through a surface of the insulation sheet to the three or more carbon wires, and one or more carbon wires that are conductors including carbon as a main material and have flexibility, each of the one or more carbon wires being one of a signal line and a power supply line; and an insulation sheet that encloses an entirety of the one or more carbon wires, includes an electrical insulator as a main material, and has flexibility, a plurality of vias that extends from a surface of the insulation sheet to the carbon wires; a plurality of metal terminals disposed on the surface of the insulation sheet; wherein the one or more carbon wires include three or more carbon wires, the three or more carbon wires include the power supply line, the signal line, and a first GND line, and in the insulation sheet, the power supply line, the signal line, and the first GND line are arranged in a direction in which the insulation sheet extends two-dimensionally and extend in parallel to each other, and the signal line is positioned between the power supply line and the first GND line, wherein the metal terminals and the three or more carbon wires are electrically connected by penetrating through a surface of the insulation sheet to the three or more carbon wires, and a plurality of loads that are electrically connected to the one or more carbon wires from an outside of the insulation sheet, and the plurality of loads each include: a power storage element configured to receive and store a supply of power from the power supply line; and an electric circuit configured to receive a supply of power from the power storage element to operate intermittently, and a power storage element configured to receive and store a supply of power from the power supply line; and an electric circuit configured to receive a supply of power from the power storage element to operate intermittently, and the plurality of loads each include an electric circuit configured to return power stored in the power storage element to the power supply line wherein the electric circuit includes a sensor and is configured to output, via the signal line, a physical quantity measured by the sensor.