I'll probably have missed a few things, but whatever.

• December 24 - Snacks: 1001 yen

• December 25 - Bread, gyoza, snacks: 3459 yen

• December 26 - Baumkuchen, waffles, drinks: 2599 yen

• December 27 - Coffee, KFC, drinks: 2817 yen

Sum total

• xx,xxx yen == AUD $yyy @ zz.z yen/dollar
• yy AUD in stuff outside Japan

About $yyy in food all up