Second season of 3D Kanojo: Real Girl.

Seventeen-year-old Tenchi Masaki grew up hearing stories about how his ancestor used a sword to seal a demon inside a cave seven hundred years ago. When curiosity gets the better of him, Tenchi goes to the cave and stumbles across the sword from the legend. Thinking that the story is nothing more than a fairy tale, he removes the blade and inadvertently releases the demon, who turns out to be a space pirate named Ryouko Hakubi. Furious about being trapped for so long, she attacks Tenchi, but he is able to repel her with the sword, awakening his inner power. After seeing this, Ryouko takes an interest in her unlikely savior and decides to crash at his place. As if it were a chain reaction, more alien women—Aeka Jurai Masaki, an uptight princess from the planet Jurai; Sasami, Aeka's sweet younger sister; Mihoshi Kuramitsu, a ditzy Galactic Police Officer; and Washuu Hakubi, a wisecracking genius—gradually come in contact with Tenchi and begin living with him. Through his encounters with these five women, Tenchi begins to learn more about his ancestry, newfound power, and the looming threat lurking beyond the skies. [Written by MAL Rewrite]

Super OVA 1: Based on a story from vol. 27 of the manga, Shampoo and Ukyo arrange to travel to a cave that is legendary for breaking up couples. They hope they will cause Ranma and Akane to break-up and Shampoo hopes to ditch Mousse the same way. Super OVA 2: "Jaaku no Oni" (lit. "The Wicked Demon") was released in 1995. Based on a story from vol. 29 of the manga, an Oni (that wears a tiger-striped diaper just like the Oni of Urusei Yatsura) escapes it`s sealed box and begins to possess people in the neighborhood. Super OVA 3: This is a story from vol. 31. Ranma disturbs a doll that takes revenge on anyone that shows it disrespect. In order to teach Ranma a lesson, the doll possesses Akane and tries on many occasions to attack him. (Source: AniDB)

Rikuo Nura, a part-youkai and part-human boy, grew up as the young master of the Nura Clan. Comprising youkai of all shapes and sizes, Rikuo treated the clan like family, however, he learned that he was the only one among his classmates who saw them in this light. To most, they were terrifying creatures of folklore who ate children and relished in bloodshed. Taking this to heart, he swore to live his life as a normal human. Normalcy, however, is hard to come by for young Rikuo. Complicating his goal are his youkai attendant, who under the name Tsurara Oikawa, goes to school alongside him; the young onmyouji Yura Keikain; and his close friend Kiyotsugu, who idolizes youkai and hopes to prove their existence. To make matters worse, rival youkai and other entities threaten to harm those Rikuo holds dear. If he wants to protect what's important to him, Rikuo must acknowledge his ancestry—that he is the grandson of the legendary Nurarihyon—and transform at night into a youkai, becoming worthy of being the next leader of the Nura Clan. [Written by MAL Rewrite]