BLUE: line・step・brush is a one-episode promotional animation for Amgakuin (AMG), a school that trains artists hoping to work in the entertainment industry. Made to mark the institute's 25th anniversary, it was directed by Kengo Saitou, and its key staff are all AMG graduates who now have careers in anime. UNDER GRAPH performs the theme song, "Ikiru". The short plays as a slice-of-life drama.