OVA bundled with the 11th Shigatsu wa Kimi no Uso manga volume. The OVA will focus on Kousei, Emi, and Takeshi when they were younger, showing their troubles during their competitions and the beginning of their rivalry.

The artificial sun that lights the frozen planet La Metalle is dying, threatening to extinguish what little life is left there. Queen La Andromeda Prometheum decides that the only way for her people to survive is for them to submit to Hardgear's transformation process, which will turn everyone's body into machines. The Queen's daughters, Emeraldas and Maetel, refuse to submit to this process, and fight to stay human.

The hero of Wansa-kun is Wansa, a puppy who is sold for a pittance, then escapes, and spends much of the rest of the series looking for his mother.

The mutinous Musashi has been defeated, and the girls from Yokosuka Girls' Marine High School are safely back home. However, the Harekaze sustained critical damage during its final encounter with the Musashi and may not be able to sail again. Moreover, rumors spread that the Harekaze-class will be dissolved due to it lacking a ship. Other classes' attempts to scout members from the Harekaze's crew only make the situation even more uncertain. The answer to this dire problem may be found in the sealed orders that the secretary of the Harekaze, Kouko Nosa, is to deliver to its crewmembers. But time is running short...