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]

Second season of Love Live! Nijigasaki Gakuen School Idol Doukoukai.

Dr. Taylor was on a paleontology mission with his son, Max in Africa. Rex, Max's best friend, joins along as well. When Max had stumbled across some magic stone slabs with images of dinosaurs, the boys and their friend Zoe were being called out by the dinosaurs for help. It seems that an evil organization called the "Alpha Gang," led by the nefarious Dr. Z, traveled back in time to hunt down the dinosaurs so that they could take over the world by using those dinosaurs. It is up to Max, Rex, and their friend Zoe to travel around the world, defeating Dr. Z and the Alpha Gang while hunting down the dinosaurs. (Source: Wikipedia)

Recap of the first seven episodes of Dokyuu Hentai HxEros