Every month before Christmas, Santa sends one of his faithful elves down to write children on and off the naughty list. The one sent down today, was Airi.

Tasked by Santa himself, she came down into Japan, posters, flowers, sales, it was everywhere! The beloved Valentine's Day has arrived, and many couples were sharing notes, giving chocolates. However, bound to the rule, Airi was FORBIDDEN to fall in love! She saw a beautiful mailwoman, and now she doesn't know what to do!