Yuichi hasn’t seen his cousin Nayuki in years. Now that he’s back, all knowledge of ever visiting has vanished. He tries to adjust to the vaguely familiar surroundings, but the gaps in his memory haunt him as time grows short. The pieces of the puzzle have appeared – an eerily silent beauty with blazing tresses, the mysterious girl with the winged backpack, and the sword-wielding demon slayer – but it’s up to Yuichi to discover how they fit together.

7 years since Yuuichi Aizawa visited his aunt Akiko in her little northern town, he returns to uncover memories and secrets that have vanished from his head. He soon realises that something supernatural is happening, and that all of his new female acquaintances have links to his forgotten past.

Misaki Kanon is a young woman who comes to the big city with dreams of becoming a singer. At first everything goes well, she falls in love and works towards her dream. But then her boyfriend betrays her and Kanon loses her faith in people and sight of her dream. Once upon a time, as a small child in a remote mountain village where the Daimajin rests, she sang the song of prayer. Now she has to regain her song to find herself and maybe save the world too. A mysterious man from the village is searching for her so that she may help him and his comrades when the time comes.

I Spy is an American television secret-agent adventure series. It ran for three seasons on NBC from 1965 to 1968 and teamed Robert Culp as international tennis player Kelly Robinson with Bill Cosby as his trainer, Alexander Scott. The characters' travels as ostensible "tennis bums", Robinson playing talented tennis as an amateur with the wealthy in return for food and lodging, and Scott tagging along, provided a cover story concealing their roles as top agents for the Pentagon. Their real work usually kept them busy chasing villains, spies, and beautiful women.

The creative forces behind the show were writers David Friedkin and Morton Fine and cinematographer Fouad Said. Together they formed Three F Productions under the aegis of Desilu Studios where the show was produced. Fine and Friedkin were co-producers and head writers, and wrote the scripts for 16 episodes, one of which Friedkin directed. Friedkin also dabbled in acting and appeared in two episodes in the first season.

Actor-producer Sheldon Leonard, best known for playing gangster roles in the 1940s and '50s, was the executive producer. He also played a gangster-villain role in two episodes and appeared in a third show as himself in a humorous cameo. In addition, he directed one episode and served as occasional second-unit director throughout the series.

Sawada Kyoka is a yoga instructor with a rough personality and constantly fights with her father after her mother passed away. Due to having to spend the time taking care of her father, Kyoka doesn't have much time for herself and has very little desire to get married. Meanwhile, Sawada Rintaro is Kyoka's father and works as a freelance lexicographer. After the passing of his wife, Rintaro hasn't been living well which frustrates Kyoka. One day, Rintaro decides to find his second life partner and wants to start a "double marriage life" with Kyoka.

A mechanical engineer who works at a maintenance center, and is in a relationship with the owner's daughter, becomes involved in an accident which results in his imprisonment. Managing to escape, he begins a journey to prove his innocence.