The bathtub premise is not a setup for a plot; it's a declaration that nothing in Rito's life will ever make sense again. Every episode commits fully to the chaos of having a horny alien princess living in your house while your childhood friend circles like a shark and your little sister develops increasingly problematic feelings, all while the show treats this domestic nightmare with the straightest face possible. The comedy wins because it never apologizes for how absurd the premise is; it just keeps piling on until you're laughing at the sheer audacity of what passes for Rito's Tuesday. The actual romance between Rito and Lala sneaks up on you under all the panty shots and alien nonsense, which is where the show's real trick lives: it got you to care about two characters while you were too busy groaning at the perversion.
Rito Yuuki's ordinary life gets permanently derailed when a naked alien princess materializes in his bathtub. Lala, heir to the Deviluke empire, has fled her planet to escape an arranged marriage, only to decide that Rito is the perfect candidate to be her husband instead. The problem: she tells everyone, including his crush and his entire school. Now Rito navigates the absolute chaos of being engaged to an extraterrestrial royal while she's still learning how Earth relationships work. What follows is a relentless barrage of ridiculous situations. Lala's alien tech malfunctions spectacularly. Her siblings show up unannounced. Bounty hunters arrive looking for her. Every day somehow gets worse than the last, and Rito finds himself caught between genuine feelings for Lala and the impossible circumstances spiraling around them both. The comedy comes fast and physical, the romance develops slowly despite constant interruptions, and the sci-fi elements keep the absurdity escalating. It's romantic comedy turbocharged by intergalactic dysfunction, where the real obstacle isn't whether Rito and Lala will make it work, but whether they'll survive trying.