Konya, Kimi wa Boku no Mono ni Naru
今夜、君は僕のものになる · こんや きみ わ ぼく の もの に なる
est. Rough estimate based on volume count, reprints and magazine — not an official figure
Overview
Haruko works as a housekeeper at Cunningham Hotel Tokyo. One day, the CEO, Izumi, makes a marriage proposal to her. He says that he's fallen for the two sides of her: Haruko the hotel housekeeper with exceptional skill, and Haruko in her private time, who stays in the hotel under a pseudonym
Source: AniList
External databases: MADB · AniList
How to compare editions, collected volumes and ISBNs / Sources, updates and corrections