A castle part of the midst of an endless winter. A vampires castle, And her butler.

When in junior high Yamato Yuuta ever being asked to going out by Kobayashi Karin if they win their third year and last concert band concours. Yuuta inquire, how then if they end up losing, and Karin response that she will attend the same high school with Yuuta and won in the next concours so the...