While the last Osaka-Tokyo Shinkansen trains departed at 21:20 (in either direction, as of 2008), Ginga departed Osaka at 22:30 and Tokyo at 23:00, and arrived over an hour before the first Shinkansen arrival the next morning.
Although the last Osaka-Tokyo Shinkansen trains departed at 21:20, the Ginga train departed from Osaka at 22:30 and from Tokyo at 23:00, beating the first Shinkansen's arrival by over an hour the following morning.