Writing · b. 1983 · Toyama, Japan Keigo Koyanagi Biography Keigo Koyanagi (小柳 啓伍, Koyanagi Keigo) is a Japanese scriptwriter and production manager. Other Credits Under the Dog Screenplay 2016 The Pot of Promise - First Love in Arita Writer 2016 Zorori the Naughty Hero: Heroes of Space Screenplay 2015 Agent-readable