Village of Mist

You play as Rinana, a futanari beauty pulled into another world with one clear goal: win over the girls she meets there. The setup is straight isekai, played completely earnest rather than winking at the genre.

Rinana's arrival in this new world sets the whole game in motion, and the story follows her as she settles in and starts building relationships with the heroines around her, one at a time.

The bulk of the roughly five-hour runtime is spent moving through this world at your own pace, talking to and getting closer to each girl until those interactions pay off. It's a sandbox structure built around courtship rather than puzzles or combat, so most of what you're doing is exploring and deepening connections until the next scene opens up.