House of the Sun Vol. 4 (Kodansha, 2017)

""As long as we're under the same roof, we're family…but I'll never be his real little sister. I know that…I know I'm the fool here for staying silent. But maybe…just maybe…"" Hiro's little brother, Daiki, is home for summer break, and Mao's taken a part-time job at a restaurant-without letting Hiro know. But by sheer coincidence, Hiro and Radical choose to stop at that very restaurant for a drink…! As Mao's thoughts run wild with envy and worry, fate conspires to bring the three of them together!