Ryou and Zen were rivals in high school, and are now salesmen in the same company. From grades to sports to the number of valentine chocolates received, every little thing was a contest. And meeting each other again in the same workplace has reignited the long-forgotten rivalry. On a current losing streak, Zen goes out for drinks with Ryou when all of a sudden they started arguing over who's more experienced in love. Both hating to lose, the two have made a new bet --this time the winner is whoever makes the other fall for them first!