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Maelstrom, known in the human world as Yuki Yoshida, is one of the main protagonists in the light novel and anime series Is This A Zombie?. She is a vampire ninja of a faction opposing Seraphim's clan, making the two rivals. Because of how her name is written, Orito nicknamed her as "Tomonori" which she allows only Ayumu to call her. She is also called "Yukinori" by Haruna.

She is voiced by Hisako Kanemoto in the Japanese version of the anime, and by Brittney Karbowski in the English version of the anime.


Maestrom is somewhat short compared to her friends. Yuki has blonde hair, the right side of her hair to be tied up using a ribbon. Oritohad asked about her breasts size, which later she accidentally revealed them to be E-cup.


Before meeting Ayumu, Maelstrom tends to act rude and tomboyish, referring to herself as "ore" (俺), which is more frequently used by boys. Upon kissing Ayumu, she starts to act more soft and attentive to him. Like all vampire ninjas, she is very honourable and always follows the rules of her village, whether she wants to or not, as shown by her accepting her "marriage" to Ayumu, though she later starts to fall in love with him for real.

Skills and Abilities

  • Tonkotsu Ramen: She is somehow able to dispel a Megalo by covering them in tonkotsu ramen, a kind of pork soup, and even had a machine which sprays the ramen soup in case of a Megalo emergency, but was destroyed later. She doesn't understand it herself, as she mentioned in episode seven, "I don't get the part about the super string theory either", but it seems to be very effective.
  • Spirit Possession: Yuki has a giant flame spirit inside her, named Mysticore. When she loses her control, it will take over her consciousness and go on a rampage, destroying everything nearby.
  • Curse Dance: Yuki is able to perform a curse dance, and the first person who spreads it to her comrades. Haruna refers this as a voodoo dance that is used by demon worshipers. It can cause someone nearby to suffer suffocation, and forcing them to dance as well.


When she and Ayumu first met, Haruna shoved him into her, causing them to kiss. By vampire ninja law, they are technically married, and, at school she treats him as a husband, making him lunch and bickering with him. Ayumu doesn't seem to take it very seriously, but Tomonori says that she's always wanted to be married.