This episode focuses on a popular new radio show called Love Line that all the girls in Usagi's class are into. Love Line's DJ, J-Dite reads one love letter from a lucky listener over the radio every night. The girls whose letters are chosen receive a pretty flower broach, which seems to be the envy of all the girls in Usagi's high school.
There is, of course, a small problem. The broaches are stealing energy from the girls, making them sleepy as their strength is sapped away. Ms. Haruna, Usagi's teacher, and Naru/Molly, Usagi's best friend, are both recipients of the flower broaches and become incapacitated by exhaustion. At Luna's behest, Usagi goes to check out the mysterious radio station that airs Love Line.
Usagi begins to wonder how she will be able to get into the station unnoticed, when Luna provides her with another tool for her arsenal - the Disguise Pen. Usagi can now use the pen to quickly change into any disguise. Usagi changes into a talent agent and gets right past the guard in front of the station.
Once in the station, Usagi confronts the monster behind it all, as well as the radio DJ now revealed to be Jadeite. Usagi transforms into Sailor Moon and manages to defeat the monster, but she cannot seem to hit Jadeite with her Moon Tiara Action attack. Jadeite begins to attack Sailor Moon, but Tuxedo Mask saves the day and Jadeite disappears.
The next day, both Ms. Haruna and Naru are back to normal. Usagi starts writing a love letter to Tuxedo Mask during class, but Naru steals it and runs around with it, with Ms. Haruna close in tow.