Mei Sagara

Mei Sagara is a third-year student at Shinryūin Academy whose petite frame and signature witch-inspired wardrobe belie a razor-sharp mind. Gifted with an extraordinary aptitude for mathematics, she quietly manages a maid café while maintaining an air of composed mystery. Once a childhood companion to the protagonist's younger sister, Mei now delights in playfully teasing Shōgo with a devilish wit, all while orchestrating events from the shadows with calculated precision—making her the pivotal figure who holds the story's deepest secrets.