Miyake Shinobu has terrible luck in men, who always seem be freaks like the lip monster or pervs like Ataru. She asks Sakura to examine whether it’s the result of a curse, but the onmyouji nurse can’t find anything. Sakura tells Shinobu it’s just her fate, but she’s still young, and her ideal man will surely come along someday.
Shinobu assumes Sakura is simply telling her this to make her feel better, but on her way home from food shopping she encounters a handsome, princely lad starving behind some trash cans. Then he eats one of her raw carrots and she sees that he’s wearing a white rabbit suit. So, another freak!
When the rabbit lad asks her on a date and won’t take no for an answer, Shinobu has the same thing for him she has for anyone who messes with her: a knuckle sandwich that sends him flying. He almost collides with an airborne Lum, but vanishes into a hyperspace portal.
Shinobu discovers he left a mysterious old fashioned key behind. Upon returning, the rabbit guy, named Inaba, rejoins his co-workers, also guys in rabbit suits. When he realizes he doesn’t have the key, they all panic, for the key in the hands of a “normie” could be catastropic.
But then they realize there’s no way a normie would be able to use a key, because they assume Shinobu doesn’t know an alien girl who can build a door for the key. Once opened, Shinobu, Lum, and Ataru all fall through and enter the same dimension full of doors where we saw Inaba running around in last week’s closing scene.
Since Shinobu opened another door while falling, the trio decide to go through it. They end up in a place that looks and feels like their town, but everything’s a little different. Then a ganguro cycles past, Ataru chases after her, and Lum chases after him, leaving Shinobu all alone in this strange place.
It isn’t long until she encounters someone addressing a woman with a kid as “Shinobu”—someone who looks and sounds a lot like her. When the kid addresses an older version of Ataru’s mom as “grandma”, it confirms it: she’s in a future where she married Ataru. This is … not optimal for Shinobu, and Inaba pops out of a trash can to confirm she doesn’t accept this particular fate.
Meanwhile, Ataru and Lum spot Sakura’s fiance with two kids, one of whom looks like Sakura. Ataru assumes the guy is two-timing Sakura, but when they follow him home they find they got married after all. Once her husband has seen their kids to their respective rooms, he and Sakura start getting hot and heavy, which not only Ataru and Lum but also Shinobu and Inaba can’t help but watch until Sakura sends them packing.
What of old Ataru? Well, Mendou arrives by Toyota Century to personally fire him from his corporation, once and for all severing all connections with his high school nemesis. Present-day Ataru ends up catching Future Mendou’s sword, but Lum spots Ataru talking with a future Lum (when she switched from bikini to a dress, we may never know).
Unfortunately for our Lum, this Ataru is speaking to Lum like a friend, not his wife. He also mentions her husband, who turns out to be Rei, while Ran is revealed to be a miserable spinster devoted to making Lum and Rei’s lives a living hell. It’s just not a particularly optimal future for anyone.
Before they can make another move, the four are swiftly captured by Inaba’s co-workers with the “Fortune Manufacturing Office.” They ponder whether to send these contaminated normies to a dark dimension or simply drug them, and settle for serving them tea Mad Hatter-style before bonking them on the heads with wooden mallets.
Alas, these FMO officers don’t know who their effing with. Between Ataru’s elusiveness, Lum’s flight ability, and Shinobu’s strength, the three are able to easily give their captors the slip, taking Inaba along with them. He leads them to an FMO locker room where they all don bunny suits so they can travel freely through possible futures.
Did I mention that Lum and Shinobu are made to wear bunny girl costumes, not bunny mascot costume like Ataru? Anywho, they try another door hoping to find a better future, only to find an even worse one where Lum is married to Lum and now does ojou-sama laughs, while Ataru is a literal footstool, and Shinobu is the spinster still pursued by the lip monster.
The next handful of futures they try out are basically the same, except for small aesthetic details. So as Inaba said, finding one’s ideal future is extremely difficult and not something that can be left to chance. Even so, Shinobu, Lum, and Ataru are all heartened that none of these futures are set in stone.
Lum could presumably find a future where she’s married to her darling, Shinobu could find one where she’s married to her ideal man, and Ataru could find one where he has a harem of all the women in his life and more. But it’s more likely they’ll ultimately end up back where they started, in the present day where anything and everything is still possible.