恋ケ窪くんにはじめてを奪われました = Koigakubo-kun stole my first time
こいがくぼ くん に はじめて お うばわれました
est. Rough estimate based on volume count, reprints and magazine — not an official figure
External databases: MADB
How to compare editions, collected volumes and ISBNs / Sources, updates and corrections