Muta no Aru Seikatsu

When Yukari witnessed her boyfriend of three years cheating on her, she ran away from the house where they were living together. Desperate for a place to stay, Yukari's brother introduces her to a minimalist man who lives in an empty room! Yukari, who cannot bear to throw away her ex-boyfriend's things, resists the man's attempts to make her get rid of her stuff... This is a romantic comedy about two people from different professions, genders, and ways of thinking, who end up living together in a turbulent situation!

(Source: Big Comic Spirits, translated)