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Much more intense drama, wild fun, hilarious moments and references, as well as loads of new characters to meet.
FYI - everything in the folders on the computer is NON CANON to the story unless it is later added to the game. So as far as "cuck" or "NTR" stuff - that will remain exclusively on the dark path, which becomes a choice around 69 days into gameplay (depending on how quickly and efficiently you proceed through the story events).
Sounds like you're having fun. The MC prologue appearance is explained thoroughly if you pay attention to various events and read some of the side-content in-game when a certain 'reading' area becomes available...
We appreciate your enthusiasm. Hope you enjoy the misadventures, drama, and hilarity to come.