Nanba Io

Nanba Io is the elder sister of Umeda Rio and Umeda Hokuto and is the mother of Dorm Leader Nanba Minami. She is introduced in the third volume of Hana-Kimi, when she requests that Hokuto work at her inn. Her brother instead offers Mizuki, Sano, and Nakatsu in his place and Hokuto leaves before she has a chance to object. She discovers Mizuki's secret while she's changing out of her clothes and later provides Mizuki with more comfortable vests to cover up her developing body.