In addition to pack-in bonuses such as setting materials, cast interviews, and an original short story, the box set features an original animated episode focusing on Biwa Hayahide, Narita Taishin, and Winning Ticket.
“Umabako: The Fourth Corner” retails for 12,800 yen ($113.07 US) plus tax, and it will be released in Japan on December 19, 2018.