Ep. 13: Haru searches for a mysterious firefly while leaving items behind for his friends to find.

Shizuku studies at home when Haru enters through the window, asking if she has seen "him." Confused by the vague reference, Shizuku urges Yoshida to clarify, but Haru insists on secrecy and departs, forgetting his phone. As Haru searches for the unknown target, he repeatedly leaves objects behind, which his friends collect. Yu retrieves Nagoya, Haru's rooster, and brings it to Haru's house, where the group gathers to return the lost items. They assume Haru is looking for Nagoya, but Shizuku leaves the group to go home. On her way, she encounters Haru, who denies seeking the rooster. He reveals he is actually searching for a glowing firefly, a creature unlikely to appear in winter. Despite Shizuku's skepticism, they spot one, and Haru admits his true goal is to share this moment with Shizuku. Shizuku reflects that many stories about her friends and Haru remain untold. The epilogue shows Yu waiting at Haru's house with Nagoya when Haru and Mitsuyoshi return home.

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