"Gurenge" (紅蓮華, "Red Lotus") is a song by Japanese pop singer Lisa from her fifth studio album Leo-Nine.

It was used as the first opening theme song for the Japanese anime series Demon Slayer: Kimetsu no Yaiba.

[3] On March 24, 2019, the official website of the anime Demon Slayer: Kimetsu no Yaiba revealed the opening theme song "Gurenge" that would be sung by Lisa.

[12] In May 2019, "Gurenge" was certified gold by the Recording Industry Association of Japan (RIAJ) for 100,000 full-track digital music downloads.

[13] In July 2020, "Gurenge" was certified million by the Recording Industry Association of Japan (RIAJ) for 1,000,000 full-track digital music downloads.