In Episode 33, the complex relationship between Itoshi Rin and his older brother Itoshi Sae is explored. As children, Rin admired his brother, who was a football prodigy and dreamed of becoming the best striker in the world. Together, they made plans to win the World Cup—Sae as the best striker, Rin as the second-best. Sae's extraordinary talent earned him a lot of attention, but he remained distant and focused solely on football.

Sae leaves Japan to join the prestigious Royale Academy in Spain and urges Rin to work hard and catch up to him. Determined, Rin strives to become the best in Japan. However, upon Sae's return, Rin is shocked to learn that Sae now aims to become the best midfielder in the world. This change leads to a conflict, in which Sae challenges Rin to a one-on-one match. Sae defeats Rin and declares their shared vision over. Deeply hurt, Rin's admiration turns into bitterness, and he vows to surpass Sae.

In the present, the Blue Lock team faces off against Japan's U-20 team. Isagi Yoichi's parents and Bachira Meguru's mother proudly watch the game, noticing their sons' joy on the field. Chigiri Hyoma's family is also present, delighted by his return to football. During halftime, coach Ego Jinpachi praises the team but warns them not to let up and urges them to keep playing offensively.

Meanwhile, tensions rise in the U-20 locker room as Sae announces his intention to leave the game, believing the team is too weak. However, captain Aiku Oliver convinces him to stay by bringing in Shidou Ryusei, a talented but difficult player. Intrigued by the potential of the "Devil," Sae agrees to continue playing, setting the stage for an explosive second half.

As the game resumes, Rin is determined to destroy Sae's dream and channel his frustration into motivation. The episode ends with the promise of an intense showdown between the teams and a pivotal turn in the brothers' rivalry.