Ai C is a composition by Feryquitous, ported from ONGEKI bright MEMORY into maimai DX BUDDiES PLUS under the ONGEKI & CHUNITHM genre. It is the third entry in Feryquitous's self-produced "Ai" series, following "Ai Nov" and "Ai Drew", songs where the composer personally handled composition, arrangement, lyrics, and vocals. At 191 BPM, the track's energetic, rhythmically dense style carries across all three SEGA rhythm game franchises: ONGEKI, CHUNITHM, and maimai. In maimai, the song was initially unlockable through the ONGEKI Area 7 event, requiring 550 km of accumulated in-game travel distance during a limited period from August 30 to November 7, 2024. The song's maimai charts were designed by Luxizhel (Expert) and Melonpop / メロンポップ (Master), both of whom crafted layouts that make full use of the DX five-note-type system. The in-game category label "Ai" itself derives from an ONGEKI title, reinforcing the cohesive thematic identity Feryquitous built across the series.