"Ultramarine") is a song by Japanese duo Yoasobi, featuring an uncredited chorus by cover group Plusonica,[1] from their debut EP, The Book (2021).

[5] "Gunjō" was certified diamond by the Recording Industry Association of Japan (RIAJ) after surpassing 500 million streams in the country, the duo's second song after "Yoru ni Kakeru".

[6] Yoasobi performed "Gunjō" for the first time as a full group, including band members, and Plusonica on the YouTube channel The First Take, uploaded on February 26, 2021.

The show depicted Ikura standing on the escalator downstairs to perform on the stage, where Ayase, the band members, and the orchestra gathered there.

[12] In January 2024, "Gunjō" was mashed up with Vaundy's "Hana Uranai", and fryer chime's sound, titled "Tirori Remix 2024" for McDonald's Japan's promotional video.