Koganei Kyoudai no Kyuusoku
小金井兄妹の休息 · こがねい きょうだい の きゅうそく
est. Estimation indicative basée sur le nombre de volumes, les rééditions et le magazine — non officielle
Présentation
An otaku-minded older brother Arata and his gyaru younger sister Hana live together in the suburbs. The two of them spend this summer vacation they never expected to have as they please. (Source: Web Action, translated)
Source : AniList
Bases externes: AniList
How to compare editions, collected volumes and ISBNs / Sources, updates and corrections