Mariko Mangaka ni Narimasu!
マリコまんが家になります! · まりこ まんがか に なります
est. Rough estimate based on volume count, reprints and magazine — not an official figure
Overview
All the knowhow you need to become a mangaka, from writing the story to drawing the pictures skillfully. (Source: Ultimate Manga Guide)
Source: AniList
External databases: MADB · AniList
How to compare editions, collected volumes and ISBNs / Sources, updates and corrections