Gurenge (紅蓮華) is LiSA's powerhouse anthem that served as the opening theme for the 2019 anime phenomenon Demon Slayer: Kimetsu no Yaiba. Composed by Kayako Kusano and written by LiSA herself, the track blends driving rock instrumentation with LiSA's signature soaring vocals, capturing the resolve of protagonist Tanjiro Kamado. The single was released in 2019 and quickly became one of the most recognizable anime songs of its era. In the rhythm game sphere, Gurenge arrived in maimai DX Splash as a launch title on September 17, 2020, categorized under POPS & ANIME. Its five DX charts, Basic 3, Advanced 6, Expert 9, Master 11, and Re:Master 13, each reflect a different facet of the song's energy. The Expert chart, laid out by 隅田川星人 (Sumidagawa seijin), introduces dense tap patterns at 135 BPM, while シチミヘルツ (Shichimi hertz) crafted the Master chart with a balanced mix of slides and holds. The Re:Master chart, designed by Jack, pushes to 707 total notes with an emphasis on slide-heavy sequences and break-note spikes, making it a standout level-13 challenge in the Splash era. Outside maimai, Gurenge also appears in SEGA's CHUNITHM and ONGEKI, and was later removed from Asian maimai cabinets starting with DX FESTiVAL, marking it as a limited-time track that players who experienced it during Splash through UNiVERSE hold in high regard.