Miyako Miyazaki's Melancholy and the First Tournament - S1.E10

The team enters the high school tournament. Only Tama-chan did well enough to win. Miyako meets her middle school classmate, Otajima Reimi who has a crush on her. Miyako as such became troubled and couldn't concentrate on her match. It was revealed that Reimi used to harass Miyako when they were in middle school. The episode ends off with Kōjiro sensei discussing about a fifth member with Kirino, the club captain.