Akko continually receives bad grades in her exams, and will be in deep trouble if she does not pass the final exam of Metamorphosis Magic. Ursula decides to ask Diana to help Akko, but she rejects the idea despite her struggles with the spell. When Akko tries to use the Shiny Rod, Diana transforms her into a mouse, which results in Akko accidently being thrown out of the school by a custodian. Akko then meets another mouse named Hope, who dreams of making it to the ocean and sailing it, just like his hero. However, everyone around him doubts his ambitions, claiming the sea isn't even real. Diana then appears taking the form of a weasel in order to save Akko. Akko offers to take Hope to the ocean, however he refuses saying he'd rather get there through his own strength. Akko and Diana make it back to Luna Nova in time for Akko to take her exam, which she promptly fails.