Hime Yarizakura, the mayor of the small town of Sakurashin is assisted by Akina Hiizumi, Ao Nanami and Kotoha Isone from the Hiizumi Life Counseling Office to enforce order and assist the population and together, they end up facing a series of strange incidents when a mysterious enemy arrives at the city.

In a city inhabited by youkais and humans, Kotoha is an exception, becoming a half-youkai when she was struck by a mysterious lightning when she was a kid. But when she is struck once again, her powers go out of control and start threatening the city until her friends come to save her.

The Hiizumi Life Counseling Office is assisted by a pair of Ogre siblings, Kyōsuke and Tōka Kishi, who must control their massive strength to not injury those arround them. After an incident with Tōka makes her regret her condition, Kyōsuke lashes his fury at Akina, whom he believes is yet to awaken the power of "Tuning" that runs in his family and could help Tōka, until Akina prove him otherwise.

With Hime in no condition to fight, Akina and Kyōsuke distract the enemy while the rest of the team look for the source of the barrier to disable it.

Following the events of Hoshi no Umi, Zakuro attempts to adapt herself to her new life as a resident of Sakurashin. While Akina pays a visit to the memorial to his grandfather and all the youkai tuned by the Hiizumi family, he is confronted by Enjin, who attempts to possess his body, but is saved by members of the senate, but little they know that Enjin soon after learns to control the same power they used to defeat him and becomes an even more dangerous threat.

Believing that her sister Lila is dead, Juri tells Hime the story of their childhood together. However, when Juri reveals that she has no intention to see her sister if possible, Lila appears and attack them.

While Juri reconcile with her sister, Akina confronts Enjin, and learns the true reason for his grudge on the city and gets himself in a pinch when the enemy shows a glimpse of his true powers.