Are high-school girls Nanoha and Chidori ready to face the storms in their new romantic relationship together?

Nanoha and Chidori are best friends who attend the same all-girls high school--and also share a heart-pounding secret: they're lovers. Through sunny days and tumultuous storms, they're always ready for new adventures together.

As the snow falls, Chidori and Nanoha look forward to the next major events in their relationship: Christmas, winter break, the upcoming semester, and most importantly, Valentine's Day. Whether or not the future holds happiness for them, they want to cherish the time they have together in a winter wonderland.