A five-minute song that feels like sitting in a room where nothing needs to happen. The animation moves at the pace of breathing, matching Tamai and Izumi's voices so completely that you stop noticing where the music ends and the image begins. This is the kind of thing people bookmark to play on mornings when the world feels too loud.

A Sou ka! is a single music video made for the song of the same name, credited to Kunihiko Tamai and Akane Izumi. The song was showcased on Minna no Uta, a program broadcast by NHK. As a one-episode music release, it presents the song with visuals rather than telling a longer story.