Ryou and Zen are two men who hate to lose–especially to each other. From high school rivals to rival co-workers, these two men have always been locked in fierce competition. They’ve competed over grades, sports, and even the number of Valentine’s chocolates received! And now that they’re salesmen at the same company, their rivalry has reignited.One night, while out for drinks, the two begin arguing about who’s more experienced in love. Suddenly, their newest competition is set: the winner is whoever makes the other fall in love with them first! But will this competition of hearts really lead to a win or something far more complicated?
 
(Source: Seven Seas Entertainment)
 
Note: Includes 1 extra chapter.

At odds with each other since their high school days, corporate salesmen Ryo and Zen have finally become lovers. The transition has not been a smooth one however, with each man still baiting the other into petty competitions as they struggle to navigate their new dynamic. And with their hectic work schedules cutting into their time together, it isn’t long before anxiety and jealousy begin to creep into their hearts. Yet just when it seems that positive progress is being made, their coworker, Futami, returns to the main office from Osaka and tries to insert himself into Ryo and Zen’s rivalry! But is some friendly competition all he’s after? 
 
(Source: Seven Seas Entertainment) 
 
Note: Includes two extra chapters.

Zen Shitou