The story follows six middle-aged men who have experienced success and failures in their lives. One day, they decide to become an idol group and overcome such barriers as their age and their physical condition.

In the world of Neverland, humans and monsters live alongside each other. Generation of Chaos details the start of the adventures of the two heroes of Neverland, Chiffon and Roze. Departure of Chiffon Chiffon is a boy with the power to train monsters. After realizing that his power is waning, he sets out to Hiyoko Forest to return his Hiyokomushi—a fish-like mount and companion—back to its homeland, the Hiyoko Forest. However, the journey there is anything but uneventful as his control over his monster gradually loosens. Roze's Decision Roze is of half-demon descent, living a quiet life among humans with her sister Emilia. One day, as Roze returns from work, she sees her house being set on fire.The destruction of her home shatters her dream of being able to live peacefully with humankind, as she is reminded that harmony between demons and humans is far from becoming a reality.

No longer concerned with military affairs, Yukichi Fukuzawa intends to act as a lone bodyguard-for-hire, making use of his deadly swordsmanship. However, things are not going as planned for his freelance business, and that is when he crosses paths with a mouthy boy named Ranpo Edogawa. While their initial interactions are intertwined with a bizarre murder mystery, the aftermath prompts the formation of the Armed Detective Agency. Presently, Ranpo finds himself chasing down a gifted individual with the dangerous ability to execute the perfect crime. But as the great detective unravels the case, he soon discovers an elaborate plot to obliterate the Agency in its entirety. Although forewarned of the trap, the Agency continue their pursuit of the criminals, only to end up framed for the crime themselves. Now branded as wanted terrorists, the remaining members must find a way to prove their innocence—even if they must turn to sworn enemies for assistance.

On a rainy afternoon, a male high school student awakens freezing on the streets with no memory of how he got there. His classmate and crush, Karen Inukai, finds him and takes him back to her home where, to his surprise, she starts to undress. She seems intent on bathing with him, though he has no idea why. When she holds him once more, he catches a glimpse of himself in the mirror—discovering that he has turned into a dog! Inukai adopts the puppy and names him Pochita. Now, he must adjust to life as a dog and figure out how to get out of this strange predicament. But while he mulls over an escape plan, Pochita sees a whole new side to Inukai that he never saw at school.