last train from Tokyo to Osaka

Hi Shikha,

1.) I do not think that there will be enough time to travel on the Osaka if you arrive around 8.10. The Shinkansen stop service around midnight and it is about 3 hours from Tokyo to Osaka, that means the last train would depart around 9pm.

2.) Either Tokyo station or Shinagawa, there's not much difference. Sometimes one connection works out better than the other but you can use either station.

3.) The first day is counted as a full day, no matter what time you first start traveling.

Hope this helps,
Daniel