ハロ／ハワユ (romanized as Haro／Hawayu) is a VOCALOID original song by nanou (ナノウ), sung by Hatsune Miku. The title is a phonetic wordplay on the English greeting "Hello / How Are You," rendered entirely in katakana, a kanji-free pun that echoes the song's theme of reaching out while feeling isolated. At a slow 95 BPM, the track carries a melancholic, introspective mood with lyrics that dwell on loneliness, self-doubt, and the small dishonesties people tell themselves to get through the day. The song was added to maimai on September 4, 2014, as part of the GreeN PLUS update, placing it in the mid-era of the arcade series. Its in-game video features a dance routine rather than the original niconico upload visuals. The song originally appeared under the "niconico" genre category, which was later refined to "niconico & VOCALOID" starting from maimai PiNK onward, a taxonomy change that reflects how the game began distinguishing general niconico content from dedicated VOCALOID tracks. In maimai, ハロ／ハワユ has undergone several difficulty revisions across versions. Its Master chart, designed by mai-Star, sits at level 12 with a dense 492-note count dominated by 416 Tap notes, a demanding spread for a song at this BPM. The Expert chart was designed by はっぴー. Despite its slow tempo, the charting emphasizes steady streams and precise timing, making it a distinctive challenge among slower VOCALOID entries in the maimai library.