The musical composition formed a dwelling power in the girl. A legendary opera, a magnificent composition created in the past. A new life—"Musicart"—imbued with the score. An ephemeral, beautiful, and fateful tale of girls fighting with the power of musical scores in a world where music has been forgotten. They just aim for the delight that lies beyond. Takt Op. connects music to tomorrow. (Source: MAL News)

It looked like it would be a normal day for Ganta Igarashi and his classmates—they were preparing to go on a class field trip to a certain prison amusement park called Deadman Wonderland, where the convicts perform dangerous acts for the onlookers' amusement. However, Ganta's life is quickly turned upside down when his whole class gets massacred by a mysterious man in red. Framed for the incident and sentenced to death, Ganta is sent to the very jail he was supposed to visit. But Ganta's nightmare is only just beginning. The young protagonist is thrown into a world of sadistic inmates and enigmatic powers, to live in constant fear of the lethal collar placed around his neck that is slowed only by winning in the prison's deathly games. Ganta must bet his life to survive in a ruthless place where it isn't always easy to tell friend from foe, all while trying to find the mysterious "Red Man" and clear his name, in Deadman Wonderland. [Written by MAL Rewrite]

In the wake of their first home burning down, Nasa and Tsukasa Yuzaki are seeking temporary shelter at the Arisugawas' bathhouse. Though they have only been married for a short time, their relationship has only become sweeter by the day. Nasa is determined to spend as much time with his wife as possible, basking in the happiness of their marriage. The newlyweds find new ways to explore their relationship. From adopting a cat, going to an amusement park, and even watching an impromptu romantic comedy featuring Nasa's former teacher, every day is a new experience. But while Tsukasa continues to meet the people in Nasa's life, Nasa has yet to meet more of Tsukasa's family. Though they appear to be the picture-perfect couple to everyone around them, Nasa begins to wonder if he will ever learn more about his wife's mysterious past.

Ittoki Sakuraba fails to understand why his mother, his uncle, and his childhood friend, Kousetsu, seem to take his security so seriously. Kousetsu constantly follows and observes him with no regard for his privacy, focusing only on keeping him safe every waking moment. But the consistent hounding starts making sense when an adorable second-year student at his high school, Satomi Tsubaki, asks Ittoki out on a date. Though initially innocent, Tsubaki's true intentions soon become apparent when Ittoki visits her house; she plans to assassinate him, and she is not alone. Surprisingly, the ones who come to his aid are his uncle and Kousetsu—donning their dark and deadly ninja attire. After Ittoki is escorted to safety, his mother reveals the truth: he is the 19th heir to a noble clan of ninjas known as the Iga, and the target of assassination by their rival clan, the Koga. In order to protect himself against this new threat, Ittoki must hone his skills at the only ninja academy remaining in Japan: the Kokuten Ninja Academy.