The heroine is the songwriter of a popular band, her father is a lawyer, and her mother is a former forensic doctor. Regarding this band, I think it is the heroine's own, and the hero Tezuka
PS: To add, I forgot to explain the setting of this iceberg when I was studying at Tokyo University.
Band name: Blue Wings
Bass: Takumi Ichinose
Keyboard: Ren Motojo
Drummer: Naoki Fujieda
Female vocalist: Keiko Yamada
PS: The names of the band members are borrowed from people in NANANA, and the lead singer's name was randomly found by someone with help.