天使の翼。 (Angel Wings) is an original Vocaloid-style track by producer A4。, first released as a self-titled single in 2022. The song features a dual-vocal arrangement performed by two voice synthesizers from the CeVIO AI / KAMITSUNE ecosystem: KAFU (可不) and Gekiyaku (ゲキヤク). The official music video was produced collaboratively by A4。, mi, and su. In maimai, the song was added to the niconico & VOCALOID category of でらっくす BUDDiES on March 8, 2024, and later rolled out to Asian and Chinese region editions in 2024–2025. Lyrical themes trace a volatile emotional arc, opening with frustration, self-deprecation, and cries of "最低だった" (it was the worst), then shifting toward empowerment as the narrator declares "見てよ僕に翼が生えたから" (look, I've grown wings), directly echoing the title's angelic imagery. The Master chart (Lv 12+, constant 12.9), designed by カマボコ君, is a stamina-heavy 703-note arrangement that foregrounds dense Tap patterns (517 notes) alongside 87 Slide notes, demanding sustained focus across its 2:27 runtime. The Expert chart (Lv 9+, constant 9.6) was designed by サファ太, while the Basic and Advanced charts carry no credited designer. The song has no appearances in other music games as of its maimai debut.