Upon on your arrival at Tokyo station, please take a Hikari or Nozomi Shinkansen train to Nagoya. Then transfer to Meitetsu Nagoya station ,and take a train to Higashi Okazaki Station.

<TRANSFER GUIDE AT MEITETSU NAGOYA STATION>

Alternatively, you may take a long and tiresome sojourn, get a Kodama Shinkansen train at Tokyo Station heading for Toyohashi since most of the Hikari Express do not stop at Toyohashi station.
Please ask station master or check with the timetable which stops at Toyohashistation if you want to take Hikari Shinkansen Express faster than Kodama Shinkansen.

Upon arrival in Toyohashi, you should then take a Meitetsu train to Higashi Okazaki Station.
<TRANSFER GUIDE AT TOYOHASHI STATION>