SPOILERS - On Gaku will be discussed at length and spoiled. Go watch it first! (or not)... Richmond and James have an impromptu discussion after immediately after rolling the credits on the 2019 film On Gaku: Our Sound(音楽) written, directed and animated by Kenji Iwaisawa and based on the 2005 self-published manga - Ongaku to Manga by Hiroyuki Oohashi.