Kamen Rider Kuuga
Generally, episodes of "Decade" are titled similarly to the episodes of the series that they reference. "Kamen Rider Kuuga"s episodes were titled with only two kanji and episodes of "Kamen Rider Kiva" have a musical reference and musical notation in the title. For the World of Hibiki story arc, the episode title cards are stylized in calligraphy similar to the styles featured in "Kamen Rider Hibiki". For the World of Amazon story arc, the episode title had a reference from "Kamen Rider Amazon" episode 3. An episode arc also features a crossover with "Samurai Sentai Shinkenger".