Kitsune no Yomeiri

Rin and Len are siblings born into a prestigious samurai family that governs the land of Musashi. Raised alongside their uncle, the current head of the clan, they have long enjoyed a peaceful and happy life within their ancestral domain. However, as Rin grows older, her feelings for her younger brother deepen into something far more profound than familial affection. Len, acutely aware of his sister's romantic devotion, begins to carry a heavy burden of guilt over the situation, knowing that her love is directed toward him. Their fragile equilibrium shatters when news arrives of ongoing negotiations with the neighboring province of Owari. To secure a political alliance, Len has been chosen to enter an arranged marriage. While Rin fiercely opposes the arrangement, desperate not to lose the man she loves, Len quietly accepts the inescapable reality of his duty as a nobleman. The fate of both siblings now rests entirely in the hands of the young woman selected to be Len's bride—a girl named Miku. Kitsune no Yomeiri is a light novel adaptation based on the Vocaloid song of the same title created by OSTER project.