The main character is an ordinary Japanese schoolboy. For the time being, his life was carefree. Everything changed when one spring his friend and his girlfriend officially announced their relationship. Before that, the boy had never even thought about the fact that it was time to look for a soul mate. But now that the example of a successful relationship appeared before his eyes, he realized his own loneliness for the first time. Some time later, his little sister invited our wretch to a tennis match, where he met a wonderful girl.