"Seishun Dokei" (青春時計) is the first single by Japanese idol girl group NGT48.

It was released on April 12, 2017.

[1] It reached number-one on the weekly Oricon Singles Chart with 160,271 copies sold.

[2][3] It was also number-one on the Billboard Japan Hot 100.

This 2010s Japanese single-related article is a stub.