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Lucifer is a band formed by guitarist Yuki and drummer Santa after their previous band broke up. They recruit bassist Towa, young guitarist Atsuro, and vocalist Sakuya, who initially resists joining. The band faces challenges both in the music industry and in their personal relationships, including disagreements with their parents and the difficulty of Sakuya, who has a troubled past, to cope with his emotions and his complicated relationship with Aine, a teenager who writes lyrics for the band.