rai's part are mostly continued off game, theres extra content by butakoma, cg and playable mini game to show,idk, in my opinion rai's brothel part more boring than standart rpg. btw, there is no ray hcg? only chibi?
Cg is the one he release on website and everyone share, all rai's waifu prostitute and mikami co, while extra mini game have 2 part, 1st is the interaction with unique prostitute at max affinity, example with tabana she will show she remove her husband's ring and replace with rai's, this content and other interaction is canon and is actually available in main game if u got your lovers at max
2nd part is most likely what-if, show you what happen and the interaction when they got ill-fated cucked, in maingame it just show how theyre doing so much better without in description while in this minigame it explores more, example, tabana removed both her husband and rai's ring, and got into relationship with one of her customer, want to divorce her husband and wants platonic sex relationship with rai, and want the brothel to take care her infidelity child with that customer, its mostly ntr , cuck and mean dialogues from all the unique prostitute
the CG release from Butakoma is a mix bag, it shows more continuation from ill fated cucked , how tabana instead blatantly show she got ntr-ed, she decided to go brood parasitism part, and plan to get pregnant with the affair child and wants rai and her husband take care of it without their knowing (she still keeps the ring), while theres other stuff like how mikami and cos get addicted to abo*rtion stuff, but theres also a cg with char you didnt get sex scene in game (you'll know who is it)