In the end, "Gearless" Joe was the one that reigned as the champion of Megalonia, a first ever megalobox tournament. Fans everywhere were mesmerized by the meteoric rise of Joe who sprung out from the deepest underground ring to the top in mere three months and without the use of gear. Seven years later, "Gearless" Joe was once again fighting in underground matches. Adorned with scars and once again donning his gear, but now known only as Nomad… (Source: TMS Entertainment)

An artificial island in Tokyo Bay—Kyokutou Houreigai Tokubetsu Chiku (Far East Special District), commonly known as the 24-ku (24th Ward). Childhood friends Ran, Kouki, and Shuuta, who were born and raised there, have different family backgrounds, hobbies, and personalities, but always hung out together. However, their relationship changes drastically in the wake of a certain incident. At the first anniversary memorial of the incident, the three friends happen to meet again and their phones begin to ring simultaneously. The phone call is from a supposedly dead friend, urging them to "choose the future." The three will try to protect their beloved 24th Ward and the future of its people in their own ways.

While walking through the forest one day, a witch named Alyssa finds a bush glowing with a magical aura. She discovers a baby who, although not a witch, possesses magic that is too strong for that of a mere human. As such, Alyssa decides to raise the child as her own, naming her Viola. Sixteen years later, Viola is all grown up and now towers over her youthful mother, and her mature looks cause many to confuse their ages. Nevertheless, Alyssa adores her child despite Viola's possessive streak and tendency to drive away anyone she fears will take away her mother's love. Viola may not be sure where she came from, though she has all she needs in Alyssa and the plethora of Alyssa's friends who have come together to raise her. Under Alyssa's guidance, Viola will learn to master her magic and make her adoptive mother proud.

Mini OVA episodes bundled with the Blu-ray and DVD releases of Valkyrie Drive: Mermaid.