Leave it to Cupid! is the 13th episode of Pastel Yumi, the Magic Idol. It first aired on May 30th, 1986.
Yumi takes a bath after getting dirty from playing baseball. She finds a love letter in her shoe-box at school! When she goes to the meeting place written in the letter, the boy who shows up is Hiroshi from her neighboring class. But, oh no! The letter was meant for Hirata Eri instead. Yumi delivers Hiroshi's letter to Eri and helps the two of them sneak away for a little date. But will they get back before Eri's mom finds out?