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Sailor Moon SuperS Plus: Ami’s First Love Description:

Plot Summary: Quiet bookworm of the Sailor Senshi Ami takes pride in her studies, but a rival naming himself "Mercurius" is suddenly outscoring her on the national exams. Combine this with a sudden love letter and a youma feeding on Ami's stress over the whole situation, and Sailor Mercury finds herself in a huge pinch.
Sailor Moon SuperS Plus: Ami’s First Love Episodes: