In the 2000s, Isa, a 15-year-old, wakes up and sees the lavender flower that Tania, the girl she is in love with , gave her. Isa excitedly writes a letter confessing her feelings, planning to give it to Tania during break. Upon arriving at school, with the help of her friend Monse, Isa faces several obstacles in delivering the letter to Tania, turning her perfect day into the worst.