Mitsuki is a quiet, seemingly well-adjusted 15-year-old who moved in with her older brother Yuuya after their divorced parents remarried. Her life took a weird turn when an angel possessed her on the way home from school—one that's apparently got the hots for Yuuya. Now she constantly switches between her normal personality and the angel's, usually playing it up around her brother to grab his attention.
Things got worse when she ended up locked in a magical chastity belt tied to a love gauge that tracks Kotobuki Hiyori's satisfaction. The gauge fills whenever Hiyori's content (sexually or romantically), and drains slowly if that neglected. The belt's a major pain, especially when Mitsuki needs to use the bathroom—it unlocks for three minutes at a time, then automatically re-locks and won't open again for at least an hour.
Content compiled by AnimeList.moe from publicly available sources.
