Spike sneaks into Zecorah's place and 'borrows' a special flower. Smelling it will make あなた fall in 愛 with the first person あなた see. Obviously he tries to get Rarity to smell it, accidentally infecting everyone in ponyville in the process. Eventually everypony's chasing Spike in a lovestruck stampede, causing Celestia to come down from her 城 to see what the ruckus is about. When she too smells the 花 and falls in 愛 with Spike all hell breaks lose.
Spike is forced to ask Zecorah for help. She creates a ピンク 雲, クラウド of fog, that cures everypony. Luckily for Spike nopony remembers a thing. In the end he writes a letter to Celestia, about how 愛 is something that cannot be forced.