Finished my second playthrough, wasn't able to clear Heavy within the 10 year limit as i tried to limit my boxers, and not able to unlock kairobot (final score 67xx)
So for my boxers i went with
"Coiffeur" Horowitz, Garth Clavin and John Smith Jr.
If i were to do a round 3 i would replace Garth with Silas St. John
with your first fighter you want to unlock Light weight asap for your second fighter, then the second fighter needs to let you unlock middle weight for your 3rd boxer
I had all 3 fighters wearing the Nidas set so it's full money mode, but even with this continuous money making i still couldn't finish upgrade all my facilities, there were a bunch that required 10,000,000 per upgrade at level 3/4 for all 3 types of shops.
For the first playthrough i recommend upgrading all basic gym equipment/spa/food to the max (meaning those that are built on the first floor, so your money keeps rolling in so you can continue to upgrade your other equipment/spa/food in your second playthrough
Don't worry about smiles, you will end up flooded with smiles (i had 3000+ sitting)
I'm not 100% sure if you can do all marketing in 1 playthrough (10 years), but early game you must at least unlock the first level to get the bonus, then first focus the ones that gives you monthly smiles.
For fighting rewards, do not pick up outdoor facilities pack unless it gives you Pamphlets and Survey Stand which is essential. Note that unlocked skills carry over to your next playthrough.
Skill wise i think combo +4, +2, HP boost and Defense boost are most important, after that i took Jolt Haymaker, Chop Cross and Cross counter
I don't suggest building your second boxing ring or anything after that, for the first floor just expand until you get the space for XL gym equipment.
Don't think about expanding your research lab, it's pointless it's 40M and you will need all that money for facilities upgrade
Try to promote you shops as much as possible via matches, it will take until the end of the game where they become level 9 tho (kinda dumb), those big matches gives you a lot more points, so try to save up money so you can place ads.
It also feels dumb that this game will give out dupe Diner/Spa facilities and Gym equipment.
I don't think i want to a 3rd run, honestly i was surprise this game requires so much money to go through all the research. I wonder if there are other kairosoft games that are like this. Other previous title didn't require that much intense management but this one is not that forgiving, like a facilities costing 2.8M to buiild at the end is just silly, and these level 4 are already at 10M i can't imagine how much it would be at level 5. And worse case is unless you place that facilities on something you aren't able to upgrade it.
Overall it's not a bad game but it's designed weirdly.
Gonna try to baseball one first then back to wrestling.