第 4 集: Hibiya 反思他夏天的掙扎，並犧牲自己以打破熱浪循環。

The episode starts with a continuation of the events in Kisaragi Attention, and shows Hibiya Amamiya, the young boy Momo had met and lost while being chased by the crowd, wondering who that strange girl was. Having bought what he was told to get at the store, Hibiya fantasizes about the possible reaction of Hiyori Asahina, his friend and crush, which he could receive for bringing her an additional gift. Upon showing her the dinosaur keychain he bought for her, Hiyori however reacts negatively and insults Hibiya for thinking she would like such a gift. The two of them talk about Konoha, a young man living with Hiyori's uncle as his foster son. Right as they talk about him sleeping for fourteen hours, Konoha enters the room, asking who they are, despite a lengthy introduction to each other the day before. While they have dinner together, a show on TV shows Momo as an idol and Hibiya recognizes her. Hiyori, as a big fan of Momo, complains that he did not get an autograph, although Hibiya had no idea that she was an idol. He then thinks back of all the trouble he went through to be able to be with Hiyori that summer, having to lie to his parents about taking summer courses in the city. The next day, Hibiya wakes up in the Heat Haze, where he repeatedly has to watch Hiyori die, before he ultimately sacrifices himself to save his friend, thinking it is the only way to stop the loop both of them are caught in. (Source: Kagerou Days Wikia)

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