Cute, pleasant, profound... "Mansion" with cat manga and illustrations. (Source: Kodansha, translated)

What is this lovers' quarrel unfolding before my eyes? Nagane Tomoya is a new employee in the general affairs department of a trading company. He takes pride in his seemingly inconspicuous job, supporting all the employees behind the scenes. One day, disaster strikes when he accidentally breaks his important pair of glasses. Surprisingly, he finds he can still see perfectly well—but what he sees isn't quite real..? (Source: Libre, translated) *Note: Chapter count includes 2 extras.*