est. Rough estimate based on volume count, reprints and magazine — not an official figure
Overview
Maachi is a 15 year old girl who loves her brother Riichi. Actually, the two of them are not related by blood, but due to their parents work situation they are forced to live alone together. Riichi, who's looks, personality and grades are top-class, is the idol around school. But he has a huge secret, that only Maachi knows about. Riichi is actually an otaku!!
Source: AniList
Synopsis 日本語
東雲真綾（通称まあち）は15歳。顔、性格、成績バツグンな兄・東雲理一のことを恋愛対象として意識してしまう女の子。血のつながらない兄妹どうし、両親の仕事の都合上で2人暮らし中なだけに、まあちの想いは募るばかり。さて、そんな2人にはある秘密があって…。
Source: Wikipedia「アニコン」 (CC BY-SA 4.0)
External databases: MADB · Wikidata · AniList
How to compare editions, collected volumes and ISBNs / Sources, updates and corrections
Volumes
ちゅちゅコミックス First edition
2vols · 2006-09〜2007-01
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Mizuiro Jidai
水色時代
1991 · やぶうち優 · 16vols · Shōjo
DramaSchoolRomanceSlice of Life
Dolly♪Kanon
ドーリィ♪カノン
2012 · やぶうち優 · 12vols · Shōjo
ComedyDramaRomance
Gekikawa Devil
ゲキカワデビル
2016 · やぶうち優 · 9vols · Shōjo
Romance
Shōjo Shōnen
少女少年
1998 · やぶうち優 · 8vols · Kids
IdolsComedyCrossdressingRomance
Naisho no Tsubomi
ないしょのつぼみ
2005 · やぶうち優 · 8vols · Shōjo
ComedyDramaMechaSchoolRomance
Hatsukoi Shinan
初恋指南
2008 · やぶうち優 · 8vols · Shōjo
SchoolRomance
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Nogizaka Haruka no Himitsu
乃木坂春香の秘密
2006 · 深山靖宙, 五十嵐雄策 · 4vols · Seinen
EcchiOtakuComedyHaremSchool
Insufficient Direction
監督不行届
2005 · 安野モヨコ · 2vols
OtakuComedyMarriage
Sayonara, Zetsubou-Sensei
さよなら絶望先生
2005 · 久米田康治 · 31vols · Shōnen
OtakuGag ComedyComedyDramaParody
Lucky☆Star
らき☆すた
2005 · 美水かがみ · 11vols
4-komaOtakuComedySchoolSlice of Life
Welcome to the N.H.K.
NHKにようこそ!
2004 · 滝本竜彦, 大岩ケンヂ · 8vols
OtakuComedyDramaPsychologicalRomance
Bari Haken
バリハケン
2008 · 鈴木信也 · 4vols · Shōnen
OtakuGag ComedyComedyDelinquentsSchool