Quick question: Where do you live? I lived in Nagoya and I was making about 120 000¥ a month, that's 30 000¥ per week and I was a store clerk at the time. 20 000¥ paid for travel expenses to/from work and food for three or four days depending on how much fuel I used. Although given that as students we aren't paying bills for our dorms and most of the food is free it seems more reasonable.