I took myself to Tachikawa for lunch on Monday, just because I don't go places on the train often enough. It was a beautiful day and Tachikawa is a quick 7 stops from Fussa.
I had lunch at Mos Burger
My yummy lunch, 570Y (about $5.60). You order downstairs, then find a table on the 2nd (smoking) or 3rd (non) floor and they bring your food up when it's ready. They have lots of really interesting burgers on their menu, check it out here.
This is a monk standing in front of Tachikawa station ringing a bell. I think you could drop money in his little bowl.