Shiori Oumi is a man-eating mermaid character in This Monster Wants to Eat Me, presented as a mysterious schoolgirl who targets Hinako Yaotose while promising to protect her until she reaches her peak. She is voiced by Yui Ishikawa.
Shiori Oumi suddenly appears before Hinako Yaotose as a beautiful girl with sea-blue eyes. She declares she will protect Hinako until Hinako matures and becomes her most perfect self, then devour her completely.
She rescues Hinako when a shore woman monster attacks. She later enters Hinako’s school as a transfer student and introduces herself with the name Shiori Oumi.
She has deep, ocean-like blue eyes that are striking and beautiful. Her hair is long, black, and touched with a bluish sheen that enhances her mermaid aura.
She openly calls herself a mermaid and behaves like a predator disguised as a classmate. Like other monsters in the story, her ultimate goal is to eat Hinako.
Her vow to guard Hinako until the ideal moment creates a chilling balance of protector and predator. She is patient, calculating, and unwavering in her promise.
Shiori’s dual role as savior and future devourer defines her relationship with Hinako Yaotose. Her arrival as a transfer student places her close to Hinako, letting her watch over—and ultimately prepare—her chosen prey.
Voice actor: Yui Ishikawa.
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