Under the stage name Ukigmo (浮雲, Ukigumo, "drifting cloud"), he was the second guitarist for Ringo Sheena's band Tokyo Jihen from 2005 until 2012.
In 2013, Nagoka joined the band Gokumontō Ikka, a project involving Queen Bee leader Avu-chan.
He also participated in the recording of her third solo album, Kalk, Samen, Chestnut Flower, on which he played guitar on the songs "Camouflage" (迷彩, Meisai), "Consciously" (意識, Ishiki) and the vinyl record bonus track "Fig Flower" (映日紅の花, Ichijiku no Hana, which he also arranged and composed), as well as being credited on vacuum cleaner and "vocal percussion" on two more songs.
Since 2005, he has also been the guitar player and singer for his own band, Petrolz (ペトロールズ, Petorōruzu), which has released three albums and two mini-albums as of 2024.
[2] Ukigumo's cover of Pizzicato Five's "The Night Is Still Young" (東京は夜の七時, Tōkyō wa Yoru no Shichiji, "Tokyo at 7 in the evening"), with new lyrics by Shiina Ringo and renamed "Tōkyō wa Yoru no Shichiji (Rio wa Asa no Shichiji)" (東京は夜の七時〜リオは朝の七時〜, "Tokyo at 7 in the evening (Rio at 7 in the morning)"), was played during the flag handover portion of the 2016 Summer Paralympics closing ceremony.