Aiaigasa (アイアイ傘) is a VoiSona original song by composer hamu (ハム), released as the first original track for the voice synthesizer Ui (雨衣). It first appeared on Ui's official channel as a demo vocal, showcasing the voicebank's expressive range, before joining maimai でらっくす CiRCLE in January 2026. The title draws on the Japanese expression "ai ai gasa" (相合い傘, sharing an umbrella) while weaving together multiple homophones of "ai", love (愛), meeting (逢), togetherness (合), mutual connection (相), indigo (藍), and sorrow (哀), all recited in the opening lyric. The music video and jacket art were created by illustrator 逢編いあむ. Musically, the track moves at a gentle 116 BPM with a bright, catchy melody that complements its lyrical theme: finding small happiness in everyday moments, framed around the intimacy of walking together under one umbrella. In maimai, the Master chart, co-designed by きょむりん (Kyomurin) and はっぴー (Happy), is notable for its high Slide note density (173 out of 587 total notes, nearly 30% of the chart), giving it a flowing, pattern-rich character at level 12+. The Expert chart, designed by Luxizhel, offers a more balanced introduction to the song at the 9+ difficulty tier.