群青シグナル (Gunjou Signal) is a maimai original song by composer, lyricist, and arranger テヅカ (Tezuka), performed by 獅子神レオナ (Leona Shishigami), a character from SEGA's rhythm game オンゲキ (ONGEKI). The track debuted in maimai でらっくす FESTiVAL on December 16, 2022 as part of the Sky Street Area 3 (スカイストリートちほー3) progression campaign. At a brisk 206 BPM, the song pairs an energetic, driving instrumental with Leona Shishigami's soaring vocals. Its lyrics weave imagery of light piercing through water, sea-firefly lanterns, and a blue signal guiding the way forward, a metaphor for determination in the face of uncertainty. The music video was produced by 群青リコリス (Gunjou Licorice) / Masako Wada, whose visuals echo the song's aquatic and sky-themed motifs. 群青シグナル is embedded in the Sky Street narrative arc, a multi-song storyline within maimai DX FESTiVAL that follows a professional basketball player whose career is cut short by injury. After being offered a chance to redo his past by a mysterious figure named Noah, he finds himself transported back to his childhood in Sky Street, a domed city, where familiar faces and an unexplained hourglass set the stage for a second attempt at life. This flavor text connects the song to other FESTiVAL-era originals within the same area. Beyond maimai, 群青シグナル crossed over into CHUNITHM LUMINOUS PLUS (via a maimai collaboration MAP) and オンゲキ bright MEMORY, where Leona Shishigami appears as a level 35 crossover opponent, the second チュウマイ-genre song in ONGEKI to feature an opponent character from another game. On the charting side, the MASTER difficulty (level 13+, constant 13.8) was designed by ものくろっく (monoclock), while the EXPERT chart (level 11+, constant 11.6) was handled by 翠楼屋 (Suirouya). The song runs 2 minutes and 31 seconds in length.