Koi no Kanri wa Dekimasen!
恋の管理はできません! · こい の かんり わ できません
est. Rough estimate based on volume count, reprints and magazine — not an official figure
Overview
Reiichi Hoshino, a gay salesman, can't help but be interested in Haruki Madoka, a man in the systems management department who is seen in the company as a weirdo. One day, he impulsively confesses his feelings to him and they start dating, but he's not good at socializing and has zero dating experience. Hoshino even mistakes his excitement for Madoka for a cold. Still, he is irresistibly drawn to Madoka, who is manly despite his clumsiness and more devoted than anyone else---
Source: AniList
External databases: MADB · AniList
How to compare editions, collected volumes and ISBNs / Sources, updates and corrections