The Ancient Magus' Bride: Season 1, Episode 1

1 - 1: April Showers Bring May Flowers

Having given up on life, 15-year-old Hatori Chise sells herself at an underground auction, where she is bought by Elias Ainsworth, a not-quite-human mage, for 5 million pounds. She learns that he intends for her to be his future bride, and her world begins to change.