Yūkyū no Kobako is one of several Yūkyū Gensōkyoku fan discs. This one features a variety of high-quality videos and illustrations from the first game, as well as a many illustrations and information as a preview of the then-upcoming Yūkyū Gensōkyoku: 2nd Album. Also included is a quiz mode where you can test your knowledge of the characters and the world of the games.