(Reveiwed version 1.0)
A VN that tries to hide its many flaws behind overwrought prose.
Plot-wise, it's as advertised. You are in college. Your sister arrives. You bang. There are also another couple of girls, and you may bang them too.
Visually, the game is undercooked. Most of the story is told sprite-over-background style, except for the sex scenes that are a series of three or four short animations played with no connecting shots between one and the next. No attempt is made to have the characters express emotion: whatever is happening in the game the characters have the same dead expressions like actors who haven't been paid enough to be here.
A visually unimpressive game might make up for it in plot and writing, but this one doesn't. This is a game where nothing really happens. It is a sequence of scenes where love interests just kind of fall on the protagonists's dick without him having to do anything but be there. Allegedly you start off the game estranged from your sister then make up, but you never actually do anything about it, you just show up and it happens.
The game tries to hide this flaw in flowery writing, never using a five cent word when a ten dollar word is available, but that just adds to the alienating feeling of the disconnected plot and robotic acting: the characters don't have any character, and the protagonist's internal monologue does not sound like how anyone would actually speak.
Bland.