Otogi御靈錄

This is a portrait-oriented idle RPG with beautiful artwork and a light story, suitable for solo play. While it can be enjoyed in short, interruptible sessions, progression is heavily gated by energy timers and a pay-to-win gacha system that creates significant difficulty spikes, making it challenging for free-to-play users. It's best suited for players who enjoy collecting characters and don't mind a slow, potentially pay-to-win progression loop.