In collage on the second floor, (class to the left) there is a text saying that rose hid her food bills from kana's restaurant. ''I must pay 10 000 coins to kana, if I want special orders.'' My question is: Can it be payed in any way? 

Change you money in data file (if u don't want to spend too much time)

You will be able to pay it when City Streets map is available. Rose will really appreciate your help.

Awesome! 
Also I know how to change money, but even then, money is not a problem at all. (I grinded it while searching for real tall and trying to understand the asylum quest, which I have restarted like 6 times) I was rather afraid that maybe I have to slowly buy food for 10K