Summer Sisters

Yuu gets shipped off to a relative's countryside house for the summer, where three sisters he hasn't seen in years greet him with a little too much enthusiasm. It doesn't take long to figure out they're just as curious about naughty things as he is.

The setup is simple: a shared roof, three sisters, and a summer with nothing else to do. What starts as a family reunion slides into something else entirely once everyone stops pretending otherwise.

Play revolves around Yuu spending his vacation getting closer to each sister in turn, moving from awkward reunions to considerably less awkward encounters. It's a straightforward incest-flavored slice of countryside summer, not a branching sim with much to manage beyond who you spend time with next.