For Koishi, you do have the option of making a purchase that goes into negative amounts. The consequences of going into a negative balance will be that your character will be unable to purchase any other items and will be refused food from the cafeteria until they are out of debt. I also recommend having Koishi sign up for a job to receive income to supplement events in the future (10,000CP per job per IC day, up to 3 jobs).
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For Koishi, you do have the option of making a purchase that goes into negative amounts. The consequences of going into a negative balance will be that your character will be unable to purchase any other items and will be refused food from the cafeteria until they are out of debt. I also recommend having Koishi sign up for a job to receive income to supplement events in the future (10,000CP per job per IC day, up to 3 jobs).