A system includes a drill string made up of a plurality of connectable pipe sections. The flavor-retention agent contains an active ingredient which is obtained by subjecting a raw material such as leaves andor tubers of a potato plant to extraction and Method for Using Same. The negative electrode includes a zinc-containing negative electrode active material and an alkaline electrolyte, and the alkaline electrolyte includes a potassium hydroxide aqueous solution. Also, the cryptographic processing module can generate a different cryptographic key for each frame without requiring dynamic exchange of key information. This is a more efficient use of the superconductor. In this game system, the game devices 1 are provided with a personal information processing means 10 that can exchange personal information with other players while the online game application is executed among the game devices 1.