A song that will overwhelm your eyes.

—Jin's Song Introduction

Kagerou Days
Kanji カゲロウデイズ
Rōmaji Kagerō Deizu
English Heat- Haze Days / Heat Haze Daze
Song Information
Music and lyrics Shizen no Teki-P
Illustrations and Movie Shidu
Characters Hibiya Amamiya
Hiyori Asahina
Azami (Cameo)
Shuuya Kano (Cameo)
Sung by Hatsune Miku
Uploaded September 30, 2011
NND Link Nicovideo Broadcast
YT Link Youtube Broadcast
Album Mekakucity Days

Heat Haze Days / Heat Haze Daze (カゲロウデイズ Kagerō Deizu) is the third song of the series.


Kagerou Days was uploaded on September 30, 2011, and quickly gained views, becoming Jin's most popular song, and in turn the most popular song in the series. It has reached over 3,000,000 views on Nico Nico Douga. It also gave the Project its name.
The story behind the song revolves around a boy, Hibiya, and a girl, Hiyori. On August 15th, the two of them are spending time together in a park. Hiyori has a cat on her lap, when all of a sudden the cat runs away and the girl tries to get it back. Hibiya witnesses Hiyori running out into the street to retrieve the black cat and getting hit by a truck. The heat apparently mocks him in his daze, and he blacks out. Following, he wakes up on August 14th and goes to meet Hiyori again, where he tells her about his strange dream that took place in the park they were walking in. Hibiya suggests that they go home together, but just as Hiyori steps in front of him, a pole falls from the sky and pierces through her. The heat once again laughs at him. Before he blacks out, he notices Hiyori seeming to be smiling as she dies.
This process repeats for decades, the same two days happening over and over. Finally, Hibiya decides to take action and pushes Hiyori out of the way of the truck, so that he is killed himself, thinking it would stop the loop from repeating. In the end, it shows Hiyori was also caught in the loop. It turns out that she had been trying to save Hibiya from death as well, so the cycle still continues on.


  • There is another translation of this song, "Kagerou Daze"; however, the official uploaded video names it "Days".
  • Wannyanpu's fanmade PV is so popular, that for a time the extent people were confused with Hiyori's official appearance and Wannyanpu's fanmade version of her. Wannyanpu only joined the official producer team after the release of this fan made video.
  • Incidentally, the Never-Ending World that Azami created is also known under the name Heat Haze.
  • The black cat in this song was revealed to be Kano, who used his eye ability to make himself appear as a cat.[1]
  • In Wannyanpu's fanmade PV of the song, the truck says Jin and it features an Actor-and Ene doll at the end of the video.

Lyrics & Translation


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