From the airport:

1. It is possible to catch an airport limousine bus service from Haneda airport to Tachikawa, Hachioji, and Tama districts. It is not possible to catch an airport limousine bus service from Narita airport this year to those areas. Instead, take the limousine bus service to Shinjuku bus terminal and then take a train.

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From Tachikawa district:

If your accommodation is in Tachikawa district, catch the Tama monorail from Tachikawa-Kita (not to be confused with JR Tachikawa station) or Tachikawa Minami stations and head south in direction of Tama Center to Chuo-Daigaku Meisei-Daigaku station (about 15 minutes), which is on campus. Trains runs about every 10 minutes. There are other options, such as buses and walking, from other nearby areas, but they could be a little complicated for first-time visitors.