 The director describes his new animation film as set between ""a simple animation with extremely intense information"" and ""a live-action movie with extremely limited information"".The theatrical release poster, which was later used on the OST and the videos, features several symbols of the Japanese popular culture and modern history.Clockwise, a Boeing B-29 Superfortress passing over, in reference to the American bombing of Hiroshima and Nagasaki cities in 1945, the Tokyo Tower which was completed in 1958, the high-speed train Shinkansen 0 Series, launched in 1964, at last, the standing character eating a gyudong bowl is Foxy Croquette O-Gin, in reference to the popular "tachigui" practice.