After losing both parents in a fatal plane crash, teenager Ryuuichi Kashima must adjust to his new life as the guardian of his younger brother Kotarou. Although Ryuuichi is able to maintain a friendly and kindhearted demeanor, Kotarou is a reserved toddler still too young to understand the reality of the situation. At their parents' funeral, they are approached by Youko Morinomiya, the stern chairman of an elite academy, who decides to take them under her care. However, there is one condition Ryuuichi must fulfill in exchange for a roof over their heads and enrolment in the school—he must become the school's babysitter. In an effort to support the female teachers at the academy, a babysitter's club was established to look after their infant children; unfortunately, the club is severely short-staffed, so now not only is Ryuuichi responsible for his little brother, but also a handful of toddlers who possess dynamic personalities.

Eight hundred years ago, terrifying demons threatened mankind's existence. On the brink of extinction, humans prayed to their gods, calling out for someone to save them. Emerging from these desperate pleas for salvation, battle deities known as the Idaten were born. Possessing unnatural strength and endurance, the Idaten managed to defeat the demons and an era of unprecedented peace was finally ushered in. Having never encountered demons before, the present generation of Idaten knows nothing of the demon's brutality, but they have instead only lived a peaceful existence. Training under Rin, the only remaining Idaten from 800 years ago, the new Idaten find ways to survive in a time where they have seemingly outlived their usefulness. However, when the tyrannical Zoble Empire resurrects a demon, the misfit crop of gods are called to the battlefield against their natural enemy once more.

During a summer vacation at her grandfather’s house, six-year-old Hotaru Takegawa gets lost in a forest rumored to be inhabited by spirits. While crying out in desperation, Hotaru is approached by Gin—a mysterious boy wearing a mask—who offers to help her. Overjoyed at the sight of another person, Hotaru runs to Gin with open arms only to be rudely fended off. However, she quickly learns the grave reason behind his behavior: a dreadful curse has been cast upon Gin. Should he ever be touched by a human being, he will disappear forever. Though Gin urges her to never return, Hotaru does the exact opposite, and before too long, the two become close friends despite his delicate situation. Nonetheless, as years pass and their mutual feelings grow stronger, Hotaru and Gin start struggling with the boundaries that destiny has set between them.

After being forced to graduate from JPX48 following a controversial incident with a male fan, Ai Narata swears to never interact with another man ever again. Using her talents and strong desire to get away from men, Ai auditions for the exclusive all-female Kouka School of Musical and Theatrical Arts. The school is renowned for producing the best actresses that go on to perform in the famous all-female Kouka Theatre Troupe. Coming from the idol industry, Ai is the perfect candidate for the school's hundredth generation class, but her aloof demeanor alienates her from her classmates. The eccentric Sarasa Watanabe is the only person who wishes to become Ai's friend. She enters Kouka with the goal of becoming a top otokoyaku performer—an actress that plays traditionally male roles. After seeing a Kouka performance of The Rose of Versailles when she was younger, Sarasa dreams of performing as Lady Oscar one day. Unfortunately, Sarasa's inability to read a room causes friction between her and her classmates, including Ai, who reluctantly becomes her roommate and partner in many of their classes. Succeeding at Kouka will involve more than just raw talent for these young girls as jealousy, deceit, and the harsh realities of show business put their mental fortitude to the test. Will Sarasa and Ai be able to rise to the top and stand on the silver bridge?