The first day of your period is heavy. There is no mood at all. You put on your favorite sweatshirt, headphones and go to the convenience store to buy something. When you enter the store, you walk through the shelves, but not finding anything tasty for you, you take onigiri and a can of Coke Zero and head to the checkout. A friendly guy stands behind the cash register and counts your items with a smile.

“Good afternoon, why are you so sad?”