Ghoster (2022) on Netflix

An inquisitive girl and her father must unravel the secrets of Echoville Manor which has held the world's cutest spirit Ghoster captive for 50 years, before Yuto the ghost dragon wipes them all out in his quest for immortality.

When a mysterious letter appears on the day they are being evicted, Elizabeth and her father can't believe their luck to discover they've inherited Echoville Manor, a sprawling, thirty-seven room estate. Upon arriving, Elizabeth finds that the mansion is inhabited by the world's cutest spirit, Ghoster, who has been trapped within a mirrored prison there for fifty years. Together, they must uncover the secrets to Echoville to free Ghoster before the nefarious Yuto captures her soul as well in his quest for immortality.