Ciel found himself transported into the Harry Potter universe with an unexpected assignment from his mysterious System: cultivation through planting. Each horticultural task unlocked powerful magical rewards—Devil's Snares granted a Legendary-Tier Binding Curse, while a Biting Cabbage field enhanced his Severing Charm beyond measure. As Professor Sprout's newly discovered relative, Ciel embraced a straightforward approach to life: focus on the garden, ignore the chaos. The Philosopher's Stone remained irrelevant to his mission. The Chamber of Secrets? Let others investigate. The Triwizard Tournament warranted only a memorial planting in response. While Harry Potter confronted dark forces, Ciel ascended toward unparalleled magical power through systematic cultivation, one plant at a time. Yet even the most peaceful practitioner has limits. When Voldemort's Death Eaters destroyed his carefully tended garden, they crossed a line that demanded response. Their intention was terrorizing Hogwarts. They've awakened something far more dangerous than they comprehended.