Above a nondescript kitchen counter quietly hangs a bunch of ripe, yellow bananas. Suddenly, one of the slender fruits begins to shake, gently at first but slowly increasing in ferocity until it tears itself away from the rest. With a graceful landing, the long and curvy edible gradually rolls back its golden peels, revealing what lies beneath its firm covering to be... a cat? This mysterious feline-fruit hybrid is named Bananya. Carefree and gentle, the adorable creature dreams of one day becoming a luscious bananya bathed in chocolate. Together with his fellow bananya, this kitten cloaked in yellow passes its days without a care in the world, enjoying a rather calm and peaceful existence as it experiences what the world has to offer.

The anime's story follows Tsubasa, a new hire in the A&R department of the major recording company Gandala Music. Tsubasa is immediately assigned to oversee the idol unit "B-PROJECT," which is made up of three idol groups: Kitakore, THRIVE, and MooNs. This is Tsubasa's first job, and she gets involved in various incidents and accidents as she deals with this group of young men who each have their own differing personalities. (Source: ANN)

Natsume Tomoharu is a normal high-school student in every way with one exception: he's being followed by the ghost of his best friend, Misao. After moving into his brother's old house, Tomoharu expects to continue living his normal life but is one day left with a mysterious and locked briefcase without any instruction. At first he plans to leave it in storage; however, his house is soon invaded by multiple groups of people after the briefcase. Although still not knowing the purpose of the briefcase, Tomoharu and Misao attempt to escape with it. From there on, Tomoharu tries to learn the secrets behind the briefcase, the connections between it and Misao, and why it has the power to change the world. [Written by MAL Rewrite]

Following the first season, Tomoharu is now faced with a dilemma: if he doesn't form a contract with an "akuma," he risks losing his dear friend Takatsuki. However, doing so would compromise his own existence as it would result in him and his ghost friend Misao becoming an Asura Cryin'—mankind's biggest threat, according to their school's presidents. To make the decision even harder, Tomoharu and Misao have recovered some of their past memories—memories of a world that they didn't even know existed.