An original video anime, released on Blu-ray in a combined Hybrid Disc that also hold an Eureka Seven AO game for the PlayStation 3. The OVA is set between episodes eight and nine of the series.

Twelve years after the final OVA was shown, and the end of the manga, a new piece of Ranma ½ animation was made for the "It's a Rumic World" exhibition of Rumiko Takahashi's artwork. The new 30 minute special is based on the "Nightmare! Incense of Spring Sleep" manga story from volume 34, and was shown on odd numbered days at the "It's A Rumic World" exhibition in Tokyo from July 30th to August 11th.

Dan Bashin is a spirited teenager known for his aggressive playstyle in the card game Battle Spirits, earning him the title of "Clash King." One day, a mysterious green-haired girl transports him to the otherworldly land of "Grand Rolo," where disputes are settled by card duels. Upon his arrival, Dan is immediately thrust into a conflict between the kingdom's imperial army and its oppressed natives. There, he learns that he is a prophetic warrior known as a "bearer of cores' light," chosen to save the land from its evil king. Accompanied by a young boy named Zungurii and the eccentric witch Magisa, Dan travels across Grand Rolo and encounters the other chosen warriors through card battles. With the name of the Clash King gaining fame throughout Grand Rolo, secrets that lurk within the shadows of the kingdom's colonial past begin to surface. Only time will tell if Dan's campaign will affect the world on a scale much larger than he ever could have imagined. [Written by MAL Rewrite]

Tooru Kouno's attractive appearance draws unexpected attention on his first day at an all-boys school. Having to transfer to a school without girls has been bad enough, but adding to his list of frustrations are boys staring at him all day long. However, he hopes that there may be girls around, since he ran into a lovely pink-haired girl on campus earlier that day. After being escorted to his dorm by his classmate, Yuujirou Shihoudani, he meets a student named Mikoto Yutaka, who looks eerily similar to the girl he saw previously. To his shock, he realizes Mikoto is the girl and confronts him about this revelation. Yuujirou divulges that he and Mikoto crossdress as part of their job: a school tradition in which attractive first years are chosen as idols called "Princesses" in order to boost the morale of the students—and because of his looks, Tooru has been chosen by the student council as their third Princess!