Cherry senses doom in the air (and in his stew)—and it arrives while Ataru is cleaning his room for Shinobu while Lum is bored out of her mind and simply wants to cuddle. Shinobu is accosted on her way to Ataru’s, and ends up arriving through the window, leaving Lum and Ataru to mistake her as a ghost.
Turns out she’s on the shoulders or Rei, Lum’s fiancé who takes the form of a giant tiger-ox-thing when he’s mad. When he’s not mad, he’s a ridiculously good-looking young man, which is all Shinobu cares about. In this regard, she’s basically a male Ataru!
Love is more than looks for Lum, who won’t give Rei the time of day. Every time she clings to Ataru, Rei gets upset and transforms into the beast. He’s only quelled by the arrival of Ataru’s mom, who is immediately smitten and dolls herself up to bring roasted potatoes for the handsome new guest.
In addition to being a Jekyll-and-Hyde menace who won’t leave Lum alone, he’s also an unrepentant glutton, eating all of the potatoes meant for everyone and at least breifly forgetting that he originally came there for Lum.
When Lum reasserts her prefrence for Ataru, Rei chases them out of the house (blasting a hole in the wall) and into a park full of lovey-dovey couples. Only every time he calls out to Lum to marry him, each on of the women in the park fall for him and accept his proposal.
After running around the park winning the hearts of the gals and the ire of the guys and eating all of the food vendor’s wares, the chase comes back to Ataru’s house, and all the people from the park follow them there. Basically, thanks to being Lum’s main squeeze Ataru now has the most chaotic and troublesome alien yet all up in his space.
It isn’t long until school and free study time is infected by a toxically persistent Rei. Mendou vows to protect Lum and the other girls in the class from Beast!Rei, which Lum is fine with, but then she runs into Ran in the hall.
An enraged Ran demands that Lum help hook her up with Rei, as she’s painfully shy around him. Meanwhile Rei transforms and all the girls flock to him, leaving Mendou with all the other dudes and pathetically trying to flaunt his wealth to get the girls back.
When Lum comes back in the classroom, Rei has already eaten most of the other girls’ lunches, so he prepares to pounce on her. But she’s only a decoy to allow an opening for Ran to swoop in with her lovingly-made bento just for Rei.
He slowly, politely eats the lunch, which makes Ran think her feelings are getting through to him, but then Cherry arrives with an even bigger bento and Rei eats it the exact same way, igniting Ran’s demon mode. Then, just as quickly as he arrived, Rei announces he’s hungry and rockets home.
Rei hopes he’ll come back soon. Lum and Ataru hope he never comes back, something they can share in as a couple. Alas, when Rei said “home”, he didn’t mean the Oni homeworld, but Ataru’s house, where he is eating when Lum and Ataru arrive … and then promptly faceplant in exasperation.
Rei may not technically be a one-note character, but his two notes (raging beast and hunky yet remorseless eating machine) played ad nauseum throughout the episode grew quite exhausting … which I guess is the point! I truly empathized with Ataru and Lum (and Ataru’s dad!) enduring Rei’s foolishness.
Even if I can’t always understand Lum’s love and loyalty to Ataru, I totally get how whatever fleeting feelings she may have once had for Ataru in the past have long since dissipated, and now she wants nothing to do with him. I hate to say it, but really does makes Ataru look like the more desirable man!