OVA bundled with Niθ Art Works Vol. 2, featuring a new character named Kagekatsu Uesugi.

The world is a dark, brooding place populated by humans, but ruled in reality by powerful beings known as the Darkstalkers, and there is constant conflict between them as they try to determine who is the most powerful of them all. Zombies, vampires, werewolves - all of them compete in contests of strength and sheer will to attain their own personal goals. All of this becomes moot when a race of Aztec robots called the Huitzil decide that humanity isn't worth saving, and start waging war on the world, while in the sky, a solar god from outer space plots the conquest of Earth. And the Darkstalkers must become unwilling allies in order to save the world.

On the island of Hatsunejima, where spring is eternal, grows a particular large cherry blossom tree. This cherry blossom tree never withers, and is said to be able to fulfill any wish. However, one day, this tree had become a normal cherry blossom tree...

"Wake Up, Girls!" is the story of growth and friendship of seven girls living in Sendai, Miyagi who form the idol group "Wake Up, Girls! (WUG)" and work together to become top idols. Operating under a small production company in Sendai known as "Green Leaves Entertainment," WUG overcame countless obstacles to beat national idol group "I-1 club" at the Idol Festival and win the event. They had suddenly become top idols... but with an idol recession going on, things weren't so easy. The days of steady and honest idol work continued for the girls. Meanwhile, Sendai-based middle school trio Hayashi Ayumi, Morishima Otome, and Atsugi Itsuka have developed an increasing desire to become idols... (Source: wikia.com)