Acquainted Ch. 1 v0.1.1 by Yuno Gasai - Adult Sex Game

Overview:
Grappling with the usual challenges of daily college life was supposed to be hard at times, but fun. At least that's what Lewis [MC] thought... That is, until his girlfriend broke up with him and his clingy sister joined the same college as him while he's still trying to rebound and recover from the breakup. Handling all of those things and keeping up with classes might've been possible, but that changed when a mysterious girl from his dreams appeared.

Acquainted is an episodic adult VN centering around mystery, romance, corruption, and storytelling.