Kenta Saijo is a middle school student and the best friend of protagonist Shuichi Azuma. Their close friendship fractures when Azuma unexpectedly quits the baseball team, sparking a major confrontation between them at their isolated island middle school on the eve of the culture festival.

As their argument reaches its peak, a powerful typhoon strikes the school. During the chaos of the storm, both Kenta and Azuma encounter a mysterious girl with red eyes named Noruda, whose presence is inexplicably linked to the typhoon. These extraordinary events involving Noruda and the typhoon become the catalyst for resolving their conflict. Sharing the intense experiences of the storm, including their efforts to help Noruda, Kenta and Azuma reconcile and mend their fractured friendship.

No further details about Kenta Saijo's backstory or development beyond this reconciliation during the typhoon are provided.