Janken Exorcist

You're heading to Yomei Village to take up your master's mantle and put down the local yokai, one rock-paper-scissors match at a time. Whether that's really the whole plan is another matter, since the monster girls you're meant to be exorcising seem to have their own ideas about what you're there for.

The setup is simple inheritance-quest stuff: prove yourself worthy of the mantle by clearing out the evil haunting the village. The yokai, unsurprisingly, aren't interested in a clean fight so much as a personal one.

Combat runs on janken, reading your opponent's hand and countering it turn by turn, with victory and defeat both leading somewhere the source is happy to leave to your imagination.