The feelings of the junior, Mai, overflow... and a storm brews in her heart── Good fortune often invites mischief; clouds gather around the moon, and storms rage around flowers── This is a saying that illustrates how good things are often met with obstacles. After overcoming a big fight during their school trip, Chidori and Nanoha deepen their bond and return. Meanwhile, the junior, Mai, who has feelings for her childhood friend Nanoha, spends her days with a tightening heart. In such a moment, Mai unintentionally confesses her feelings to Chidori...!? A storm rages in her heart──