Urusei Yatsura: Always My Darling is the sixth and final movie in the continuity of the 1981 Animated Adaptation of Urusei Yatsura. It is a Non-Serial Movie released in celebration of the series' 10th aniversary on August 18, 1991, and would subsequently be re-released as a double-feature with the first Non-Serial Movie for Ranma ½ on November 2, 1991.
Lupica, the princess of a alien world far removed from Earth, is in love with Rio, a local tofu seller who has been the closest thing she's had to a friend since they were kids. Believing he doesn't return her feelings, she sets upon the idea of using the universe's most powerful love potion - but it's hidden in a temple and can supposedly only be accessed with the aid of the universe's most lecherous man. When her computer pinpoints Ataru as that man, she seduces him into helping her, only for Lum to interfere. When Lum accidentally causes Ataru to fall in love with Lupica, she tries everything to turn him back to normal.
This film contains examples of:
- Be Careful What You Wish For: Lum tries to use the Love Potion on Ataru. She succeeds... but he imprints on Lupica, not Lum.
- Childhood Friends: Lupica and Rio became friends when they were both kids and her dad bought tofu from Rio's dad to help Lupica get better. They were each other's best friends, and fell head over heels for each other.
- "Could Have Avoided This!" Plot: As Benten irritably points out in the finale, Lupica and Rio have been in love all this time and they could have avoided this entire mess if they'd just talked to each other, as opposed to Lupica leaping straight to the Love Potion.
- Crouching Moron, Hidden Badass: Ataru is... well, Ataru, but during the quest to find the Love Potion, he displays some very impressive feats of agility and speed, including effortlessly wending his way through a series of crushing traps.
- Gone Horribly Right: Lum attempts to use the Love Potion on Ataru, and succeeds... in making him fall for a different girl.
- I Can't Believe a Guy Like You Would Notice Me: Gender-flipped. Rio is a Nice Guy... but also painfully aware that Lupica is a princess and he's just a tofu salesman. He doesn't have the courage to tell her how she feels because he feels the social gap is insurmountable.
- Ladykiller in Love: Played for drama when Ataru is dosed with the Love Potion and falls head over heels... for Lupica, who finds him repulsive and abandons him to pine endlessly for her.
- Love Potion: The central MacGuffin of the film is the universe's most powerful love potion.
- We Want Our Jerk Back!: Lum is so distraught, and Ataru so pitiable, after he gets dosed with the love potion and bound to Lupica that even Mendo decides he has to help Lum cure Ataru.
- Wisdom from the Gutter: One of the reasons why Lupica needs "the universe's horniest guy" to find the Love Potion. One of the first major steps to finding it is in a room where a sexy female voice beckons listeners to cross what appears to be a bottomless pit. Lupica's underlings mock what seems to be an incredibly lazy trap, but Ataru goes charging off... and reveals previously invisible floating platforms that lead to the room where the Love Potion is concealed.
