The first episode, introducing the heroine of the story; a 10-year-old girl named Erin and her mother Soh-yon, a beastinarian who cares for Tohda in the Tai-Koh Region in the Village of Ake.

A Touda rider from a neighboring village comes to the Village of Ake seeking medicinal help for his Touda. Soh-Yon is called to the Touda and, with Erin's help, manages to revive the Touda.

Erin sees the fearsome side of the Tohda during an exhibition for the Duke.

Erin hears that Shaju's older sister has been engaged. But while eating a rice cake, Soju, Shaju's sister, suddenly falls ill. Soh-yon diagnoses Soju's illness as "Mock milkweed poisoning" a poisonous plant that was mistaken as a plant used in the cakes. Soh-yon decides to ask her clan, the Mist People, for the medicine.

Erin encounters the comedic duo, Nuk and Mok as they attempt to steal a Tohda egg for money.

On a rainy night, Soh-yon is summoned to the underground Tohda ponds. There, Soh-yon finds all the Kiba, the Duke's most prized Tohda, dead. Knowing what would happen next, Soh-yon decides to spend the entire day with Erin. But later that night, soldiers come to the house. It was only then that Erin learned that her mother was going to be sentenced to death.

Soh-yon is executed by the way of the Tohda after the Duke's Kiba mysteriously die. Erin jumps into a lake full of Tohda in an attempt to save her bleeding mother, but her mother has her whisked away to safety while she is eaten alive to atone for her sins.

Joh-on, a beekeeper living in the Shin-Oh Region, finds the unconscious Erin floating in the river. He rescues her and nurses her to health, as she attempts to cope with the loss of her mother.

While staying with the beekeeper Joh-on, Erin decides to have Joh-on teach her to be an animal breeder and live with him.

Erin and Joh-on both go to the Capital to shop for supplies. There, Erin meets a man named Ia-lu, a Seh-zan, playing a lullaby "Birds of Dawn" on the harp. Later, Erin meets Ia-lu again, who was about to kill Nuk and Mok, the two former egg thieves she met in Ake. While hearing a woman nearby singing "Birds of Dawn," she manages to convince Ia-lu from killing them. Ia-lu gives Erin his harp and the two former egg thieves say that they will follow Erin to repay her for her kindness.

Joh-on decides to have the entire family move to his summer cottage in the mountains. While cleaning his regular home, Erin finds out that Joh-on used to be a teacher. But when Erin finds Nuk and Mok sick from eating some rotten food, Joh-on comes and helps Erin read a book about poisonous plants. He decides to teach Erin, Nuk and Mok about animal breeding and plants.

Erin finds a large, silver feather in a tree close to Joh-on's summer cabin high in the mountain. Joh-on tells Erin about the king of beasts, the Ohju, and Erin's interest in the Ohju begins to grow.

While walking in the woods, Joh-on slips and falls onto a ledge of a steep cliff. Erin goes out and finds the hurt Joh-on, and decides to stay with him until morning came. While on the ledge, Erin and Joh-on witness a wild Tohda about to eat a baby Ohju. All of a sudden, they see the mother Ohju fly into action to save her baby and eat the Tohda.

The first recap episode; Nah-son, a scout sent by the Mist Elders to watch over Soh-yon, tells the Elders what happened to Soh-yon and her daughter Erin. He tells the Elders that Erin is alive, and is now 14. She is living with a beekeeper named Joh-on and 2 former thieves, Nuk and Mok. He vows to always watch over Erin to repent for not saving Soh-yon.

Joh-on's son comes and asks his father to become a teacher again. When his son learned that his dad had a young girl living with him, he offered to have her come live with them and have Erin marry-off. But Joh-on decides that he's happier with Erin and asks his son to deliver a letter to an old friend at an Ohju breeding school.

While in town, Erin accidentally breaks the harp Ia-lu the Seh-zan gave to her when she was 10. She goes to a harp shop to have it fixed, where the carpenter Yantoku was Ia-lu's friend. Ia-lu coincidentally happened to be in the shop when Erin came and immediately recognized the green-eyed girl he met 4 years ago. But after she left, Ia-lu was ordered by his troop to kill his teacher, Hagaru, due to treason.

At a festival celebrating the Shin-Oh's birthday, Ia-lu the Seh-zan, along with a baby Ohju, are injured by an assassin's arrow during an attempt on the Shin-Oh's life.

Erin passes the entrance exam with flying colors and becomes a Kazalm student. There, she meets the Reverend of Teachers at Kazalm, Esal, who is also an old friend of Joh-on. And from there, Joh-on and Erin say their tearful good-byes.

Erin begins to feel like she needs to be more like other students, losing sleep, and comedically falling asleep during her welcoming party. Her new friend Yuuyan told her that she can just be herself.

Professor Esal decides to let Erin take care of the baby Ohju Lilan after talking and observing her in action. She says that Tomura, the person who is currently talking care of Lilan, is not ready to take care of her yet.

Erin begins to take care of Lilan and finds out that Lilan won't eat anything, and has been eating her fur. When she hears Lilan's cries, she comes up with the idea to use her harp to try to communicate with Lilan. It didn't work, until she fell asleep and accidentally hit the harp under her blanket.

Erin goes to the capital with Tomura and her two followers, Nuk and Mok, to go back to the Yantoku harp shop and change the harp to make a sound resembling an Ohju. They are allowed to borrow the shop for a few days while Yantoku is out. In another part of town, Ia-lu reopens his arrow wound while fighting against two unknown assailants, and stumbles upon Erin and her friends. They bring him into the shop and tend to his wound. After hearing Erin's story, Ia-lu decides to teach Erin how to fix the harp the way she wants to. With Ia-lu's help, Erin is able to make the sound she wanted and help Lilan eat again.

Professor Esal talks to the other teachers at Kazalm about reporting to the palace of Erin's ability to communicate with Lilan with a harp, and not a mute whistle (It is considered against the law to not carry and use one as a beastinarian) and how she is able to become close to an Ohju. Esal tells the other teachers how she and Tomura also tried to use the harp to communicate with Lilan, but Lilan would just stare. Esal comes to the conclusion that the reason Lilan only reacts to Erin is because Lilan sees her as her mother. According to legends, only the Shin-Oh could command the Ohju. However, Erin can also do the same thing. Esal believes that if they report this to the palace, others would believe that Erin was able to command Lilan by using a magic trick of the Mist People, and not because of her own efforts. Also, she believes that the palace would use Erin's ability to communicate with the Ohju for war purposes.

The Grand Duke's two sons' paths finally diverge, with Shunan and Nugen taking their own paths after a duel.

Nuk and Mok are helping out at Kazalm and are making more work for Karisa, the dorm mother, than helping her. After considering firing them because they couldn't carry out even half the work of a single man, she decides to give them another chance and asks them to go shopping for her. They leave for town, determined not to disappoint her but end up losing the bag filled with five pieces of gold. Just as they were about to give up hope, Mok remembered how they had met Erin and had promised that they'd never be thieves again. And so they go in search of ways to earn the money back so they can return to Erin's side.

Erin takes a quiz and fails it, so Erin and the others study hard so they can advance into high school at Kazalm. After the exam, everyone leaves for summer vacation. Lilan walks up to Erin one day and starts to snuggle her; it was then that Erin realized that Lilan saw her as her mother, and that makes Erin very happy. She also finds out that Lilan can understand simple words like "wait" and "stop." Erin finally finds out from Esal that Lilan was a gift to the Shin-Oh and as such, can never go back into the wild.

Erin starts to have dreams about a place filled with thick mist, and that her mother Soh-yon was being taken into "Hikara" the bad side of the afterworld. While Erin falls asleep next to Lilan, Soh-yon tells Erin that the mist in her dreams are an image of her hesitation and how she is lost in her feelings of sadness. With Joh-on and Soh-yon's encouragement (in her dreams) she vows to work harder after she wakes up.

One morning Erin receives a letter from Joh-on's son stating simply that Joh-on passed away from heart disease. Erin becomes sullen and sad, but acts strong in front of Lilan. Professor Esal and the returned Tomura see that Erin is suffering. Esal decides to take her on a trip to Joh-on's hideout when they were still students. Erin then comes to terms with Joh-on's death and promises to live a life that will not sadden Joh-on. At the end of the day, Erin says to Joh-on's ghost, "Thank You... Dad.

Erin noticed Lilan was scratching herself against a tree trunk and thought of using a brush to groom her. She got the brothers, Mok and Nuk, to make her a bigger brush as the small brush was not efficient at grooming. However, while using the bigger brush, she accidentally hurt Lilan. Lilan was infuriated and injured Erin. Thereafter, Erin was told by Esal that the only reason Lilan is obedient to Erin is because Lilan is afraid of Erin. Erin becomes afraid to get near to Lilan due to the incident. However when the memories of the times she spent with Lilan came into her mind, she took up the courage and once again got close to Lilan.

A recap episode on Erin's stay at Kazalm; a four year time-skip where Erin is now 18 and a college student.