4화: 유니, 인터하이 서머 캠프에서 의심과 승리를 마주하다
2021년 1월 29일 방영
During their summer camp, Yuusuke Okuma joins the club. During the practice, Haijima insists that Yuni practices only his receives. This gets Yuni frustrated, but is afraid that it can possibly break their friendship once again. During the Interhigh tournament Haijima reveals that Yuni is their ace and secret weapon. this gets Yuni fired up and they win the match. To celebrate Yuni's victory, his cousins Itoko and Yorimichi take him bowling. Yuni irritates Itoko and she hits him. He then discovers that Yorimichi has got into a fight. (Source: Wikipedia)