Even in the modern day, the ancient rivalry between Tsubame and Sanjou lingers. Shuu feels this keenly when his most challenging project yet forces him to team up with someone from the other side of the river. If he ever hopes to live up to his lineage and carry on the proud Tomigawa coppersmithing name, he'll have to learn to adapt—both in his smithing work and in his own relationships! Can a tight-lipped smithing nut with terrible tunnel vision like Shuu learn to open his mind, confront his flaws, and work in a team? And can Shiina pull it together as future head clerk to discover what really created the divide between Tsubame and Sanjou in the first place?