At the Bronze, while the Dingoes play on stage, Willow and Oz talk while Buffy secretively watches Parker play pool. After the Dingoes wrap, Oz gets ready to take Willow home and Parker volunteers to take Buffy back to her dorm since it isn't safe outside. While Willow is waiting for Oz and Devon to return to the van outside the Bronze, Harmony approaches her. The two of them talk and then Harmony reveals she's a vampire and bites Willow. Oz rescues her and Harmony goes away threatening that her boyfriend is not going to be happy that they were mean to her. Buffy and Parker walk back to the dorm, and Parker discovers her scar from when Angel bit her. She tells him it was an angry puppy that bit her. He then asks her to a party the next night and she accepts.
At Giles' place, Xander is helping him put books away when Anya makes a surprise visit. She wants to know where her relationship with Xander is going, and not aware that they even had a relationship, Xander is a bit confused. Back at the dorms, Buffy and Parker are just about to kiss when Willow and Oz arrive. While Oz cleans her wound, Willow fills Buffy in on Harmony's return, including her supposed boyfriend. Harmony goes to her boyfriend who's working underground and it's revealed to be Spike. He works on plans with another vampire to dig through the floor of a crypt. Harmony persistently annoys him and he yells at her. She complains that she wants to go out, and after the use of some feminine charm, he agrees to take her out to a party.
The party happens to be the same one Buffy and Parker are attending and the two couples run into each other. A thoroughly amused Buffy teases Spike about being with Harmony saying "what, you lose a bet?" and the two vampires flee. Buffy pursues them and she and Spike fight. Harmony reveals that Drusilla left Spike for a fungus demon and that they'll be back as soon as they get the Gem of Amara, to Spike's utter irritation. Anya shows up at Xander's place and after getting her a drink, he turns around to see that she's naked. Buffy calls Giles and informs him about Spike and Harmony. Giles looks up the Gem of Amara, and he says it's a myth. Buffy says she's going to sleep but instead, goes back to the party with Parker. Harmony annoys Spike then draws his full attention with her sexual charm. Anya and Xander have sex because she's convinced it will help her get over him, and Buffy makes the decision that she wants to sleep with Parker.
The next morning, Buffy wakes up to an empty bed, and as she's searching for her clothes, Parker arrives with coffee. He says that he'll call her. Anya tells Xander that she's over him, and when he says he's okay with that, she storms out in anger. Spike wakes up to Harmony drawing on his back with lipstick and then leaves to get back to work. Buffy finds Willow and Giles in her dorm room and apparently the Gem of Amara is real. After they get rid of Giles, Buffy tells Willow about her night with Parker.
Spike finally breaks into the crypt, and thinks he's found the Gem of Amara in a necklace. Harmony prattles on while trying on jewelry, and Spike finally loses his control and tries to stake her - but she's impervious to harm. He sees the ring and after holding a cross to her, he snatches the ring and leaves to go outside. At Giles' place while they search for answers, Xander turns on the news, which is reporting on a giant sinkhole caused by the erosion of dirt beneath it. They come to the conclusion that Spike's underground digging caused it. Buffy tracks down Parker, but she finds him putting the same moves he used on her on another girl and that the sex they had was meaningless to him. She thinks it's her fault and again, feels sorry for herself. Spike shows up in the daylight and hits her.
Buffy and Spike have a spectacular fight outside. She tries to stake him, to no avail. Xander shows up but Spike quickly knocks him out of the way and continues to beat up Buffy. He talks vulgarly about her relationship with Parker, with just enough truth in his comments to sting. Then Spike makes the mistake of bringing up Angel and mocking their relationship as well. An enraged Buffy pummels Spike and takes the ring from him. Smoking from exposure to the sun, he dives down into the sewers. Later, Buffy and gang sit around at Giles's place and Buffy decides that she wants Angel to have the ring. Oz volunteers to take it when he goes to LA for a gig.
Buffy, Anya and Harmony all walk separately around campus, all single.