Ep. 1: Nao acts as Sunao's school substitute while Shuya joins the literature club

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The replica Nao assumes Sunao's identity to attend school on his behalf. This arrangement occurs because the basketball star Shuya has decided to join the literature club instead. Consequently, Nao must navigate the school environment while impersonating Sunao. The situation arises from Shuya's choice to participate in the literature club activities. Nao's role as a substitute allows Sunao to remain absent while Shuya engages in the club. The narrative focuses on Nao's actions during this period of substitution. The source material confirms these events without additional context. The dynamic between the characters shifts due to Shuya's new club membership. Nao's presence at school is a direct result of this change.