I Don't Get My Brother!
兄のことがわかりません! · あに の こと が わかりません !
est. Rough estimate based on volume count, reprints and magazine — not an official figure
Overview
Though not blood-related, Arashi has always been attached to his older brothers from his dad's previous marriage: Daichi and Aoba. When Daichi announces he's getting married to his college girlfriend, Arashi doesn't take it well. (Source: Manga Planet)
Source: AniList
External databases: MADB · AniList
How to compare editions, collected volumes and ISBNs / Sources, updates and corrections