Good day. I've tried looking and looking and asking some friends for help, but can't seem to find it anywhere... The MC is a guy trying to take his entrance exams for college or high school or something and buys an apartment. On day one, right after moving in, a girl cartwheels through the wall in a high school swim suit, and they end up just putting a mat over it. The manga (for at least the first few chapters) revolves around her (a fully grown woman) pretending to be a high schooler, and flirting with him. And her getting drunk... as the chapters went on, the MC starts to learn more about her (how she never had the chance to really have a childhood and she lives off her rich grandpa's money) and even gets to have a drink or two with the cops and learns about them too. Here's two recurring female officers (one with black hair and one with blond) that are always catching him in various situations. I can't remember when exactly I read it or when it came out or anything. But I remember coming across it some time back around about 2011 to 2014. I don't know if it was new, old, or on going at that time though. The art style was a bit on the cartoonist side (i.e. faces were kind of rounded, not sharp and angular, but also not just straight up circles).

I've been wanting to delv back into this manga for years now, and it's really bugging me that I can't seem to find proof of its existence anywhere! All my friends are like "if it's not these, then maybe it doesn't exist?!"

Edit: Imori 201! Big thanks to E44e and Robogari for assist!! Finally! That's been bugging me for at least half a decade!