Sekai de Ichiban Warui Majoأسوء ساحرة في العالم; 世界で一番悪い魔女; 世界第一邪恶魔女; The worst witch in the world.

Quinta is an infamous grand witch who has lived over 300 years and is known for her cruelty and killing other witches. She's shrouded in mystery and secrets, but the truth is, she's actually only 16 years old. In an unexpected turn of events, Quinta becomes a bodyguard for Nestor Gilroy, a renowned professor with 5 PhDs, who is being hunted down for his unpublished research. Together, Nestor, Quinta, and her animal companion Feeyo embark on a journey in order to have Nestor's results published.