Kazenone City, it is a city that made people feel nostalgic and wonder. It was also the home country of Okano Makoto and his little sister, Hinata. They came back this town in order to look for their mother who had disappeared suddenly. Their friends and childhood friends welcomed their return. Makoto began to notice something important through the encounter with them. With the tone of a harmonica, and with their thoughts in their hearts, the fantastic tale began in this mysterious town. (Source: AnimeNfo)

Okano Makoto transferred to the school in his home town. There, he spent normal but happy school days with his sister, Hinata, a jokey classmate, Tachibana Tsutomu, Shikouin Kasumi, Tsutomu's childhood friend, and other friends. One day, after school, Makoto heard someone playing the harmonica. That melody made him feel something old, and it brought him to the roof of the school buildings. There, he met a girl in the dusk. It was Narukaze Minamo who turned her face to him with a smile. She was a childhood friend, but they had lived separately for years. Hiding their true thoughts, Makoto and his friends spend their lives in school. Their stories in a mysterious town are about to begin. (Source: AniDB)

Suffering from frequent asthma attacks, young Anna Sasaki is quiet, unsociable, and isolated from her peers, causing her foster parent endless worry. Upon recommendation by the doctor, Anna is sent to the countryside, in hope that the cleaner air and more relaxing lifestyle will improve her health and help clear her mind. Engaging in her passion for sketching, Anna spends her summer days living with her aunt and uncle in a small town near the sea. One day while wandering outside, Anna discovers an abandoned mansion known as the Marsh House. However, she soon finds that the residence isn't as vacant as it appears to be, running into a mysterious girl named Marnie. Marnie's bubbly demeanor slowly begins to draw Anna out of her shell as she returns night after night to meet with her new friend. But it seems there is more to the strange girl than meets the eye—as her time in the town nears its end, Anna begins to discover the truth behind the walls of the Marsh House. Omoide no Marnie tells the touching story of a young girl's journey through self-discovery and friendship, and the summer that she will remember for the rest of her life.

Renzaburou Taki appears to be a regular salaryman, but in reality, he is a member of the Black Guards—a secret organization that maintains the fragile harmony between the human and demon realms. As the time to renew the peace treaty approaches, Taki is tasked with guarding the important human mystic Giuseppe Mayart, with the help of a demon woman named Makie. However, this is easier said than done; while a dangerous faction of demons has turned to terrorism in hopes of destroying the unity between the two realms, Giuseppe wants nothing more than to sneak off and fool around with women.