Horimiya manga volume 13 features story by HERO and art by Daisuke Hagiwara.

Just like Hori and Miyamura themselves, their friends are multifaceted too, with a variety of faces for their outside lives and home lives. And lovable pest Iura is no different! As it turns out, at home, he's a stern but kind big brother to his kid sister! Will Hori and Miyamura get to experience this surprising side to their friend?!