The Koizumi siblings have a father who is a professional violinist and a mother who is a professional pianist. Unlike her older brothers who have musical talent like their parents, Karin is a poor student at her music high school. She is proud of her twin brother Kazune, who is beginning to follow their father's footsteps into the professional violin world, but every so often, the seeming gap between them depresses her. This is a heartwarming story about the Koizumi family who love and support each other through tough times.

Once every hundred years, a phenomenon occurs in which a single man is given a "god sword" by the valkyrie. Seven years ago, one man received this power and ushered in a revolution in the northernmost country of Lorecia. Lorencia's prince, Nikolai, who lost everything in the revolution, encounters a new valkyrie. And thus fate begins to turn.

First published in 1983, the series was re-released in 1997 as a 2 volume bunkoban edition.

If I fall in love with a genius...