Full-time homemaker, Serina, is madly in love with her elite securities manager husband, Takefumi. But ever since they got married two years ago as two incurably infatuated lovers, her husband has changed. He has begun to find her unmitigated affection towards him to be “over the top” and “irksome.” As a result, he has begun to avoid her. Then one evening returning from a dinner party, Serina finds herself caught up in a little incident where she encounters a private detective named Haruki. She ends up taking a job working at his office. Though somewhat clumsy and wielding no particular talent to speak of, Serina gradually realizes that she was made for detective work. And in the process of striving for the affection of the husband she loves, she too finds herself changing and growing into a beautifully strong and independent woman.

Sawako Kuronuma looks miserable on the outside, but is actually a positive-minded girl, who looks up to Shota Kazehaya, a sociable and friendly boy. Perceiving Sawako's good intentions, he secretly has feelings for her. Sawako meets Kazehaya and makes her first friends, Chizuru and Ayane but in comes Kurumi proclaiming her love for him... Will Sawako and Kazehaya ever find out about each other's feelings?

The eruption of Mt. Fuji in 1707 released hordes of demons from deep inside the earth. Sakuya, the young daughter of a samurai killed fighting these demons, accepts a mission to travel to Mt. Fuji and defeat the evil spirits. Accompanying her on her journey are two veteran warriors who served her father, and Tarō, a young kappa, or river spirit, whom she has adopted as her little brother. Along the way, the two warriors have doubts about Tarō’s loyalties, and the young kappa himself must decide if he will stand with his own species or with the humans who have cared for him.