When Tamaki is attacked by creatures believed only to exist in myths, she's rescued by a young man who is not only part demon but also her future classmate! Moreover, he is part of a group of protectors that Tamaki will need if she is going to fulfill her destiny as a Tamayori princess--a destiny no one bothered to tell her about! If things aren't chaotic enough, Tamaki is fresh meat at a new high school and will have to learn how to deal with some very, very old school problems in Hiiro no Kakera ~ The Tamayori Princess Saga!
While her parents are overseas for work, Tamaki Ugaya heads to his grandmother's to live in the Ugaya Family home. As she tours Kifumura Village, she is suddenly attacked by a group of beasts.
In order to protect Onikirimaru, Tamaki succeeds her grandmother as the Tamayori Princess. Puzzled by her new-found persona, yet skillfully guarded by a group of protectors, Tamaki begins to unravel the mysteries behind her new identity.
After being rescued from a near death plunge, Tamaki meets Shinji, the fifth member of the Shugogo House. Though the reunion is joyful, Tamaki senses that the others are not too fond of him. Tamaki worries.
The mysterious group "Logos" lets its presence be known while Tamaki and the others head to the secret location where the sacred items are sealed. Tamaki and her guardians must stop them from breaking the seals.
Tamaki and her guardians fail to defend the first seal, and it falls victim to Logos and their leader, Aria. As the situation worsens, Shizuki urges Tamaki to release the Tamayori princess within her.
The promised battle has begun: the Logos have bypassed the seal and prepare to engage Tamaki and Takuma Mahiro of Shugogo house.
The bonds between Tamaki and the Shugogo house guardians begins to break. As Tamaki offers her consolation, the guardians rebuff her and demand answers.
A new face appears, claiming to be from the country's court Physician's bureau. Suguru and the Shugogo are unsure of this mystery man as he offers his help, unable to read his intentions and doubting his story. Tamaki takes a gamble and accepts the offer.
The gods sealed within the woods begin to awaken. Due to the weakening of the Onikirimaru seal, the gods begin transforming one after the other. Takuma an the others try to suppress the wrath of the gods.
The Onikirimaru seals fall one by one to the Logos' influence. In order to strengthen the Tamayori Princess' Guardians, both the Shugogo and Ugaya houses agree to live under the same roof.
Even through bad situations, Tamaki finds the good in everyone living together, and befriends them all. As a power deep within her stirs, Tamaki realizes the time of awakening for the Tamayori Princess draws closer.
Tamaki and her guardians realize the true meaning of living together with the Ugaya. The Logos are hunting for the last remaining seals, an the Shugogo house must split in two in order to stop them.
With the last seal broken, the Onikirimaru awakens, emitting raw power and causing the demon within Takuma to emerge. Meanwhile, the rest of Shugogo house face off against the Logos in the thrilling conclusion of Hiiro no Kakera!