A teenager summons the courage to help a friendly robot known as A.R.I. kidnapped by a ruthless lab director working for a powerful corporation seeking to turn him into a dangerous weapon in order to rule the world.

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.