Traveling through the Harry Potter world, Ciel is bound to an infinite deduction system. He can gain deduction points by swallowing objects and deduce all knowledge.

Thus, Hogwarts welcomed the most greedy foodie in history, who was also the most talented spell scholar, alchemist, and potion master...

"Eat ten Scottish round-faced fat chickens and gain one thousand deduction points."

"Consume five broken wands and gain 5,000 deduction points."

"Drink a pot of scabies potion that is about to explode, drink a bottle of spoiled love potion, drink Polyjuice Potion mixed with Snape's hair..."

"No, host, can you eat something good?"

Ciel laughed dryly.

"It's not bad to earn some points."

"Okay, Deep Blue, hurry up and deduce it for me."

"What did you deduce the Luminescent Charm into last time? Oh, yes, the Eternal Blazing Sun Charm!"

"This time, deduce the Flying Curse into the All-Seeing Heaven Attraction!"

Many years later, Voldemort returned and Charles used the Killing Curse.

Voldemort smiled: "No one knows the Killing Curse better than me..."

It was not until he saw a tide of green light sweeping across the sky that Voldemort's face suddenly changed color.

"Wait a minute, range attack, soul chain, automatic tracking..."

"You call this a fucking killing curse?!"