The Kusaribe family is a family of sorcerers under the protection of the ‘Tree of Origins.’ Their princess, Hakaze Kusaribe, was the greatest sorceress of their family. But Samon Kusaribe, a member of their family seeking to resurrect the ‘Tree of World's End,’ a tree that opposes the ‘Tree of Origins’ and controls the power of destruction, stuffs her into a barrel, and banishes her to a deserted island.

When her engagement to the prince ends unceremoniously, details of the young noblewoman Aileen's past life come rushing back and help her realize she's living inside the world of one of her favorite otome games—as the heroine's greatest rival! However, her memory has more plot holes than bad fan fiction…and the only certainty is that if she doesn't do something quick, her death is all but assured. The hero/main-love-interest can't be relied on, so why not see what the last boss has to say?