Polyphonica is a place in which humans and spirits coexist; spirits gain their energy from the music of humans known as Dantists. The spirit Corticarte and her Dantist Phoron, along with their friends in the Tsuge Divine Song Players' Dispatch Office, take on cases to help the population deal with problems requiring their unique skills. As they go about their day-to-day work, they learn more about the nature of the cooperation between humans and spirits, as well as their relationship with each other.
In a world known as Soul Shell, floating islands are mankind’s only protection against falling into oblivion. The power of the song is able to heal wounds and create miracles; a power that the young Aurica can’t seem to master. After his ship crashes, Aurica finds herself in the company of Lyner, a fighter who desperately needs to return to what’s left of the sky. Together, the duo set out to find an engineer who can repair Lyner’s ship; but monsters are afoot! With shifty engineers and fire-breathing beasts in their way, can the two manage to stay alive?
Both of these anime have characters who sing songs to use attacks. While Ar tonelico is a short OVA of the game, after watching Shinkyoku Soukai Polyphonica and this, combined with being entranced by fantasy characters singing in battle, you will most likely want to buy the anime’s game Ar toneclio: Melody of Elemia (translated to English, BTW).
As an orphan whose life is in the hands of space pirates, Coud has had no choice but to survive on bravado alone. He has nothing to live for until he finds Ren entombed amongst the treasures in the pirate ship's hold, and awakens her. In addition to being mysterious and beautiful, Ren can transform into a battle sword to help Coud fight and prove his strength -- but with this strength comes the bitter realization that power alone is not enough. Now, in a race against time, Coud must endure betrayals and fierce battles as he struggles to return Ren to her home, before it's too late...
Both of these anime have characters who make contracts with spiritual beings. Another similarity is that when the human characters desire to help these aforesaid beings out with some extra power, they sing a song. If you liked the idea of humans making contracts with spirits and some short singin' (mostly during battles for both), check the other anime out.
The Kawahira family specializes in dealing with troublesome spirits with the help of inukami, strong dog spirits that take human form. Members of the family are expected to make pacts with strong inukami in order to fulfill their duties, but their family has a black sheep: the perverted Keita, who charges people for his help. His inukami, Youko, is dedicated to make Keita completely hers. Her favorite form of punishment for him when he strays is teleporting him into the city completely naked. He's been arrested for indecent exposure so many times that he's a jailhouse regular, and is considered an outcast by his family and normal society; yet an inukami of the highest caliber chose to be his partner?! Is there really more to him than perverseness?
A place where spirits and humans meet, a time of trust and kindness, and a destiny of love and hope; such is the realm of Shinkyoku Soukai Polyphonica and Inukami!. These two series have been given birth by the anime realm as fraternal twins. They are similar in so many ways, yet still remain distinct in their own way. A powerful female spirit partnered with a normal male- tis is course of destiny that both play out. Yet, as fraternal twins, this destiny is played out in very contrasting contexts and settings.
Inukami! is the male of the two, offering light-heartedness and sheer male determination. Perhaps one can attribute the well-intentioned yet somewhat romantic jokes played out in the series to Inukami! being the male twin. Meanwhile, Shinkyoku Soukai Polyphonica is the female one. For that reason, the series plays out in a more romantic and heartwarming manner and draws out many traits that generate from ladies. That being said, Shinkyoku Soukai Polyphnica and her partner, Inukami!, are sure to spark your interest and enjoyment should you acquaint yourself with one or the other.
Long ago the Gods of the heavens fought with humans over the Akuto – a power that can create anything. Now, separated by time and space from the realm of humans, a war is raging between the heavens over the little remaining Akuto. As the floating Magical Kingdom is on the brink of destruction, both worlds are in danger and there is now only one hope for salvation. King Munto of the Magical Kingdom descends to earth in order to find Yumemi, a thirteen year old girl who has always been able to see the islands in the sky. He explains that when his kingdom falls, the human territory will become a land of death and Yumemi’s hidden powers are the only way to prevent it. But can Yumemi’s ability really solve everything when the fear of such power causes the fighting to escalate?
Both anime have a very interesting fantasy worlds that revolve around using music in some unique way. Munto is more about saving their world where Shinkyoku Soukai Polyphonica is about everyone working together in the world to make it a better place with some added fanservice in there. Both styles in these anime are very similar so check one out if you liked the other.
In a world where magic is a reality, the young Louise is at the bottom of her class. Dubbed "Zero" by her classmates at Tristein Academy (due to her zero success rate for magic), Louise (along with all first year students) was charged with summoning a familiar; and instead of a cute magical creature, the familiar arrived in the form of... Saito Hiraga, a normal Japanese boy who was abruptly teleported from his own world?! Can both Louise and Saito come to terms with their new and complicated "relationship" and (more importantly) help Saito find a way home?