Urd accidentally drinks a love potion she made for for Keiichi and Belldandy and proceeds to fall in love with anyone associated with plumbs.
Summary[]
In her latest attempt to help Keiichi and Belldandy become closer, Urd creates a pill-shaped "love seed" at the temple that will make the two of them inseparable. Urd then teleports to the Nekomi Tech campus and puts the love seed inside a thermos filled with tea, turning the drink into a love potion.
Urd is approached by Tamiya, whom she decides to use as a test subject. She offers Tamiya a cup of her tea, but he instead takes the thermos and drinks it empty, yet he seems unaffected by the love seed. Tamiya asks Urd if she's going to drink some herself, but after saying she won't, something unexplained happens that causes Urd to drink the remaining tea.
Belldandy and Keiichi notice and investigate an explosion of pink smoke nearby and find both Tamiya and Urd completely unresponsive. Belldandy immediately realizes that Urd had used love seeds, but as students arrive on the scene, Keiichi picks up Urd and they flee the area. Once they're out of sight, Belldandy explains that love seeds are similar to an aphrodisiac in that it increases desire when activated by specific words or images, but she has no idea why Urd would drink it herself. Keiichi thinks that if Urd falls in love with someone, she'll stop messing with them, but Urd secretly wakes up and sneaks away from them.
Alone, Urd admires the blossoms of the plum tree and recalls how she loved a plum tree spirit a long time ago, but who had to leave to go on a quest for something called a Golden Bush Warbler. As it's discovered, the love seeds activate for Urd whenever she sees or hears mention of plumbs. Urd then spots Professor Kakuta reading by himself and becomes enamored by him.
While searching for Urd, Belldandy and Keiichi are approached by Otaki, who is offering to sell them the motor club's brand new sweatshirts, which include the kanji for "Plum". Keiichi buys two for ¥5000. They find Urd just as she is about to kiss Kakuta and drag her away, and Kakuta comments that he felt young again for about ten seconds.
Inside a residential area outside Nekomi Tech, Urd breaks free from Keiichi's hands, but Belldandy manages to put a transmitter on Urd that tracks her location. Urd approaches a postman delivering plum blossoms and attempts to woo him and ask for his "special delivery". Belldandy uses magic to make Urd speak the same words as she does and tells the postman that she wants an Ai-Ai, a small animal native to Madagascar. Undeterred, Urd attempts to kiss the postman but overhears a nearby philosophy major say the word plumb in a sentence, making her go after him instead. Even before she touches the man, she switches her target to a father who also said plumb, and as she suddenly changes direction, Belldandy's transmitter falls off her.
Keiichi and Belldandy split up to find Urd, but Urd approaches Keiichi alone, attracted to him because he's wearing the motor club's plum sweatshirt. Urd hugs Keiichi and says that she's always loved him, but Belldandy arrives and sees the two of them together. She almost comes to tears and can't comprehend how her sister could steal Keiichi from her, but Urd pats Belldandy on the shoulder and says that she was "just kidding". As Urd teleports home, Belldandy is left to wonder whether or not her sister was actually under the effect of the love seeds.
It turns out that Tamiya was also affected by the love seeds and attempted to woo Otaki, who beat him over the head with a baseball bat.