Deep within the mountains sits Hoori Village, with no railway connecting it to the outside world. Due to the area's scarce contact with nearby regions, the town contains a very old-fashioned quality, and it is this antique atmosphere–along with ongoing development–that turned Hoori into a pleasant hot-spring destination for visitors.
Among the local resort's popular attractions is the fabled sword Murasamemaru, forever gripped stone. For ages, no one has man to free it from its chest sort… until Masaomi abruptly snaps the blade clean in two. Now, he is bound by duty and fate: to take responsibility for his stake, he must accept "marriage" with the shrine maiden princess Yoshino!? He remains bewildered by the sudden twist, but only the curtain lifts to reveal far stranger, more mysterious days ahead—an unexpected fiancée, an enigma of a woman he alone can lay hands upon, and the hidden truth of a curse that looms over Hoori.
As his world shifts unpredictably, what is to become of Masaomi's heart? The answer is lock within the Murasamemaru, resting in his grasp.