I honestly didn't know there were monsters to fight but I played this game and pretty much broke it money/reputation gain without much effort.
For this method you need a fresh game and an autoclicker(you can do it manually but it's just much handier to with an autoclicker). I took the cassanova class not the warrior one but both work.
Step one: buy the cheapest brothel and the cheapest prostitute you can buy. My first girl was rangiku matsumoto as she has a huge amount of traits that are benefitial to early game players and even late game players. If you can, I really do encourage you to get her if you can first as she just is amazing early game. But for the purpose of this method, you must get a girl whose upkeep is between 30-40 above the income at maximum. Lower upkeep is better but any higher than this makes it extremely hard.
Step two: Set your girl to the cheapest dance class you can and have your guy first be in the house to prevent negative and then work in the arena/slave market every day as cassanova or fight goblins as a warrior. This is just to minimize your losses. Your goal with this class is to raise her consistution and charisma as high as you can. Beauty courses and etiquette courses are also acceptable but constitution is the main thing you are raising. Continue to send her to class and working till you hit about 4k gold total(that means keep sending her to classes till you get rid of most of your starter cash). If there is no course that is under 100 gold, go for classes that are below 300 with a high teacher/master skill. Also, if you are on a course and about to hit 4k but the course is nearly over, finish the course. The 4k is just a baseline for guaranteed survival.
Step 3: Set your girl to work as a whore. Upgrade the house with the two gardens, activate auto cleaning and get the 30g advertisement to start bringing in customers. Your goal right now is to survive till you get your girl to rank 2-3 while raising her stats via working. When your girl gets rank 2-3 depending on how many AP she has due to raising her constitution, your should now have a self sustaining business due to that one girl. If you have achieved self sustenance(by this I mean inc taxes at end of the week) with a tiny profit, autoclicker activate and set it going at a fast rate clicking the new day button over and over while holding ctrl to do skip mode. This will slowly give you profits and raise your girls stats by her self. WARNING: If you are not self sustaining, do not autoclicker it, you will basically run out of money. Just slowly work while she does till she is self sustaining by herself.
Step 4: Using profits, upgrade her to the highest rank you can and but the best brothel you can. Sell your old one and upgrade whatever you have. If you can get it, get the statue upgrades maxed and garden ones. Activate auto cleaning and since you won't need advertisements anymore due to your girls rep and whatever brothel you have, don't bother with them., set her to work and autoclick again till you can get her to be a tayu(rank
. She is now raking in massive profit by her lonesome and due to the statue upgrade, she earns double. Set up daily sparring sessions with xeona as you should be able to afford it alongside maintaining the business.
Step 5: Autoclick till you get the best brothel or spend your time romancing an arena girl and hire her on as a guard to prevent mishaps. Place everyone in the top tier brothel and then upgrade that with everything. If you run out of money, autoclick till you get more but it is highly unlikely. At this point it is up to you what you do but I spent time getting 4 more guards and bringing my total girls to 20 whom are working as prostitutes. Get them all up to tayu and autoclick again. By now you would be in days around the thousands and you will be unable to outspend your profits and the taxes will not even dent your cash. Since you want your guards content, set the guard presence in the brothel menu to 50% and their wages to 200%(you won't lose money at this stage so its just to make them stay forever)
Step 6: Hire two more guards and get them to work so you have a total of 7 even if you can have only 5 working at once. Take your two strongest and put them into your arena team. Find a dogfight that will accept to fight your super strong team and you will gain millions of rep. Buy arena pass and then the guide is complete. Do what you want.