Titania is a high-energy instrumental composition by xi (Yusuke Ishiwata) that originated as one of the final boss songs in the original ONGEKI arcade rhythm game. In ONGEKI, it serves as the signature piece for the character Suzushima Arisu (珠洲島 有栖), a rival whom players face in a climactic encounter. Its counterpart, Opfer, was simultaneously sent to CHUNITHM, while Titania itself was ported to maimai でらっくす on October 24, 2019, as part of the ONGEKI & CHUNITHM crossover category. The track is characterized by a driving 212 BPM tempo, intricate orchestral instrumentation, and the dramatic, classically-infused electronic style for which xi is well known. Like many of xi's rhythm-game contributions, Titania builds from a restrained opening into a soaring, technically dense finale. A long version of the track appears on xi's album Storm and Impulse. The piece has no vocals, letting the layered synth and piano work speak for themselves. In maimai, Titania's MASTER chart (designed by 某S氏) sits at a level 14+ (difficulty constant 14.6), making it one of the more demanding crossover charts in the early DX era. The EXPERT chart was designed by 小鳥遊さん. Both charts underwent level adjustments across maimai versions: the EXPERT chart was originally 11 and later raised to 12, while the MASTER chart climbed from 13 on release to 14 and eventually to 14+ by BUDDiES PLUS.