The Blue Moon is Dyed by the Abyss

Kosuke finally works up the nerve to invite his childhood friend Aoi on a trip, and she says yes. It looks like the two are finally about to become a couple.

Then, at the inn where they're staying, circumstances beyond either of their control put Aoi in the sights of other men, and the trip meant to bring the two closer turns into something else entirely. What happens to her from there is the whole point.

The scenes run on large hand-drawn dot animations rather than static art, and a replay/choice system lets you go back and watch them again instead of clicking past them once. There's also a toggle for cross-section views if you want that layer of detail. Outside of the erotic scenes the game plays like a straightforward visual story about a friendship that curdles once outside men get involved.