With nonayu, whose sweet and soft voice like cotton candy portrays a pop and cute view of the world, usabeni presents a pop and cool worldview with natural and cool vocals and sad and rebellious lyrics. The two seem to be opposites, but in fact they were both early members of an idol group called Avandoned 10 years ago, and later worked together as a unit called FRUN FRIN FRIENDS in the past. released two works in two consecutive weeks as a collaboration of their solo projects to celebrate the 10th anniversary of their activities. Lyrically, usabeni and nonayu are in charge of the project. Ice Bahn was composed by teoremaa, who was also the sound producer when Avandoned was launched and has provided music to Yukkyun and SAKA-SAMA. The song is an electro-cool dance tune that incorporates K-POP sounds and mixes the transparent vocals of usabeni with the sweet rap of nonayu. PEEK-A-BOO! was composed by EnnU, a member of hyper-pop sound collective KANG SIGH HYPER CREW. The song is a medley of Gacha Pop sounds, with lyrics based on usabeni/nonayu's own student days.