The Cupid Bee resembles yellow wasp with blue stripes, with an elongated body, two long legs similar to those of a cricket, two antennae and wings and a large back with a sting and a red heart in the middle.
The Cupid Bee has the ability to cause anyone stung by its stinger to fall in love with the first person they see. The effects are immediate, causing the affected person to feel an overpowering romantic attraction towards the individual in view, no matter who they are. The effects only disappear if the Cupid Bee is crushed/killed.
Sucy orders a poison bee in the episode, but she is mistakenly sent a Cupid Bee instead. After hearing about a party at Andrew's mansion, Akko, Lotte and Sucy sneak into the party, but just as Andrew notices them and prepares to send them out, Sucy sets lose the Cupid Bee. The bee stings both Andrew and Diana, making both of them instantly fall in love with Akko, who rushes up to them thinking they are hurt. Akko being the first person they see makes it so they fall in love with her, with even a true confession of love by Diana.
While Lotte tries to help kill the bee, four boys, including Frank, get stung and fall in love with her. With Andrew's help, Akko manages to swat the bee, therefore, undoing its magic.