Tenchi Masaki heads out to tackle the big world, setting off to school in Tokyo! But not everyone is happy to hear he is moving away, as his female friends sulk and complain at the prospect of him being alone. However, Tenchi is not by himself for very long, as he soon meets a kind and compassionate girl named Sakuya Kumashiro who helps him get used to life in Tokyo. The two become close friends, but Sakuya wants more than just that, so she proclaims her love for Tenchi. This confession comes as a shock not only to Tenchi, but also the girls back home. In response, the girls decide to step up their game, and they immediately flock to Tokyo to take Tenchi for themselves. With the girls competing for his love, Tenchi must decide once and for all who the most important woman in his life is. However, he is going to have a hard time deciding, as strange events start happening that drive Tenchi further apart from his friends. [Written by MAL Rewrite]

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]

While the galaxy remains at peace, Tenchi Masaki continues to live on Earth with Ryouko and Washuu Hakubi, Aeka and Sasami Jurai Masaki, Mihoshi Kuramitsu, and the cat-like creature Ryo-Ohki. Though it sounds great to be surrounded by so many women, they always end up making things difficult for Tenchi by constantly fighting for his attention, and their attempts at household chores always end in disaster. Although life has become more chaotic since they moved in, Tenchi begins to form a strong bond with his roommates and gains more insight into their respective struggles and history. [Written by MAL Rewrite]

Ever since his powers awakened, Tenchi Masaki has attracted the attention of many powerful galactic beings, including the mysterious Lady Takami who dispatches her best warrior, Z, to observe him. Though he is under strict orders not to harm Tenchi, Z has no intention of playing by the rules and begins plotting his demise. Meanwhile, on Earth, Tenchi tries to piece together more information about his family and the universe. But as usual, his life won't be getting any easier, as his entire household enters a state of panic when Noike Kamiki Jurai—a woman claiming to be Tenchi’s fiancée—shows up out of the blue. [Written by MAL Rewrite]