Take the Limousine Bus (OSAKA AIRPORT TRANSPORT) to Shin-Osaka or Kyoto and then change to JR Tokaido Sanyo Shinkansen bound for Tokyo. And then choose the way from a) to d) for your convenience.
From Hikone station, there are two choices, taking the Direct bus or a taxi.
Limousine bus to Shin-Osaka
Limousine bus to Kyoto
Take JR Narita Express or the Limousine Bus (Keisei Tokyo Shuttle) to Tokyo. Change to JR Tokaido Shinkansen and get off at Maibara station. Change to JR Line and get off at Hikone station. Take the Shiga University Direct Bus or a taxi to Hikone Campus of Shiga University.