Even though both parents are stable and thrifty, spending very little beyond daily expenses, the hot spring has been constantly running out of money for years. Now it's been six years.,PS: A 22-year-old detective is possible, the protagonist's birthday is set later, so he is still 22 after graduation, besides, that's how twisted the occupation group is.,Besides, I wonder if you've seen Monogatari Series, where Araragi Kun became a deputy police superintendent at 23 after graduating from university. His sister joined the police force as a patrol officer while still in high school.。