Hanako Oomuro is a supporting character in the anime and manga series 'Yuru Yuri.' She is the youngest sister in the Oomuro family, making her the little sister of Sakurako Oomuro. Hanako is an intelligent and mature elementary school student, often acting more grown-up than her older sister. Despite her young age, she is responsible, polite, and has a friendly demeanor. Hanako occasionally interacts with the main cast, providing comic relief and highlighting the dynamics within the Oomuro family.