Koe no Furu Heya

A soothing voice says "You've got this." In his one-bedroom apartment, that voice becomes a small source of comfort to face the next day.

Itaru Kagurazaka, a corporate illustrator working long hours, lives alone in a soundproof apartment. One day, he suddenly gets a friend request from his former high school classmate, Fumiya Ouji, who claims that he's being stalked. Feeling he has no choice, Itaru lets him stay over. But from that moment on, Itaru finds a new kind of "stimulus" he never anticipated.

(Source: MAL News)