27-sai no Nyuugan Diary: Boku no Michikan ga Nyuugan ni Natta Hanashi
27歳のニューガン・ダイアリー : ボクの美紀ちゃんが乳がんになった話 · にじゅうななさい の にゅーがん だいありー : ぼく の みき ちゃん が にゅうがん に なった はなし
est. Rough estimate based on volume count, reprints and magazine — not an official figure
Overview
A biographical manga surrounding former SKE48 idol Miki Yakata, who is diagnosed with breast cancer and quits touring with her group as a result. Her left breast becomes removed due to the cancer resurfacing, but that won't stop her from achieving her dreams of being in the spotlight!
Source: AniList
External databases: MADB · AniList
How to compare editions, collected volumes and ISBNs / Sources, updates and corrections