They are intertwined for the most part. Some characters are not unlocked until progressing the story of others, like the twins needing the aunts story progressed.
I am having the same issue as Praveen045in that the game is unplayable in the AI Upscaled 4K (Main Game + DLC)version as all the aspect ration is off and all icons are smooshed together...
Very odd issue that I have never seen in all my years of playing renpy games
Tried existing saves and a new games but issue persists so I hope someone has some ideas as I really hope I didn't just download a 22gb version for nothing
All the interactions will have MC involved, in a 3 some girls may play when MC is recharging, or MC walks in on them joins the action, mostly these type of scenarios. I don't think there will be any scene without MC