I decided that I will rather learn how to modify save file than to play anxiety simulator in video game. Forcing players to multi task as underpaid (1000 yen converts to $6.79, which makes your hourly rate less than one USD for 8 hour shift - no wonder MC wants to fuck owner's wife) hotel worker who has to answer constantly ringing phone, gets shat on by guests when he says wrong wifi password and then has to organize fucking file cabinet.
Here's what I have found.
During startup time game loads config file and save file from folder C:\Users\[USERNAME]\AppData\Local\Hotel_Hentai. You can confirm this by starting Process Monitor, setting up the filter to a "Process Name is Komadori Inn.exe" and then search for key word "save". Game tries to load save file from two locations:
a) first it looks in local directory of executable file. In my case it was D:\Downloads\JD\KomadoriInn0.5.4b\save_slot1. You will notice that ProcMon lists that location as NAME NOT FOUND.
b) second it looks up C:\Users\[USERNAME]\AppData\Local\Hotel_Hentai\save_slot1. On my PC save files were found there so the game loads them up.
*for some reason dev changed the name of save file folder from "Komadori_Inn_0_5_demo" to the "Hotel_Hentai". Make sure you choose correct file based on your game version.
Now that were have found saves the next part is easy. Save file is basic unencrypted text file with extension .ini. You can edit it in Notepad or any file editor of your choice. Values you want to edit are:
Yen="122345.000000"
Level="0.200000"
Cha="1.700000"
Dex="1.727500"
Rel="1.200000"
Free Days="1.000000"
Notice that variables are stored in floats with 6 decimal spaces. You want to edit digit before floating point but make sure you don't level up too much at once. I did not test if all game scripts will work correctly and in correct order if you do so.
I hope this helps. Do not get exploted by virtual Japanese hotel owners for your labor.