SereNon is a duo that consists of two people, Serena and Kanon. Later on, Kaname joined their group but it was not confirmed that she had actually joined SereNon forever. SereNon holds a rivalry against MARs. Much like MARs, they are a well known idol group.
SereNon first debuted in episode 22. They were battling against MARs and they won. However, they had lost to MARs in the future contests. SereNon is a pretty experienced group, already being able to perform two jumps in one show. They perform with one song, "Never Let Me Down -Do Your Best-".