Age: 16
Birthday: January 23rd (Aquarius)
Suu is a first-year at Ohananomitsu High School in Class 1-1 and Rentarou's 23rd girlfriend. She's best known for being a numerophile—someone genuinely in love with numbers the way most people fall in love with other people. She describes it seriously: numbers each have their own distinct beauty and identity, like how 1 has this sleek, trim form, or how 3's got those shapely curves.
This passion for numbers actually makes her terrible at math, which sounds contradictory but tracks with her logic. She believes that doing arithmetic strips numbers of their identities—that turning 1 plus 1 into 2 disrespects what those individual 1s are. She'd rather keep them as 11.
Like Rentarou equally loves all his girlfriends, Suu equally loves all numbers and loves to talk about what makes each one special.
She's on the shorter side among Rentarou's girlfriends, with sky-blue eyes and short grey-and-white hair. Suu wears glasses with round lenses and has a casual style: she'll throw on just the school skirt with a black tracksuit (white stripes) and a teal sweater with a white collar.
Her name is a layered pun built on Japanese number wordplay. "Hifumi" breaks down as 一二三 (1-2-3), and "Suu" (数) literally means "number." Plus her birthday—January 23rd—mirrors her name perfectly: 1/23.
Content compiled by AnimeList.moe from publicly available sources.