Naoto wrestles with grief over Suzune's sudden loss while the Rindo clan's age-old curse presses him to secure a future generation. Bound by duty, he turns to the Higetsu family, whose spiritual strength has long intertwined with his own lineage every three cycles. As arrangements begin, the heir confronts the quiet expectations and mystical ties that now shape his path. The weight of tradition guides each step toward fulfilling the pact that protects his bloodline.