The guitar used is an American electric guitar GibsonLesPaulStandard. The price of this piano on the market is above 12000, which is Gibson's classic style. This guitar is powerful, rich in low frequencies and clear in intermediate frequencies.

In the second episode of the first season, the clerk sold it to Hirasawa Yui for 50,000 yen (about 3,300 yuan), and Hirasawa Yui was later named "Ji Tai".