In a land where flowers have forgotten how to bloom, a feared duke and a quiet girl are bound by a promise written in barren soil. Hanami Suzuran lives a simple life at the edge of her village, listening to the whispers of petals and leaves—a gift she keeps hidden from the world. When she is summoned to the cursed estate of Kurobane Tōga, the infamous Wolf Duke, she is given an impossible task: revive a garden long dead and make a single black rose bloom. The Kagerō Teien is a place where life withers, memories linger, and silence weighs heavier than stone. The Duke who rules it is cold, scarred, and haunted by a past that has seeped into the very earth beneath his feet. Suzuran soon realizes that the land is not cursed by magic, but wounded by grief—and that healing the garden may require reaching the man who refuses to be healed. As fragile buds begin to stir and the seasons slowly turn, a quiet bond forms between gardener and duke. Through patience, defiance, and unspoken understanding, Suzuran challenges the winter locked inside his heart. But some scars resist forgetting, and some promises demand a painful price. The Wolf Duke's Flower Language is a fantasy romance about grief, gentleness, and the courage it takes to let life grow again—one bloom at a time.