Haruto Amakawa, a twenty-year-old college student, loses his life in a bus accident. In his fading consciousness, his only regret is that he can't tell his childhood friend Miharu, who hasn't seen him since their high school entrance ceremony. It's a different story in the slums of the Bertram Kingdom: Rio, an orphan boy, wakes up from a nightmare in the corner of a dirty hut. At once, the memory of another person, "Haruto Amakawa", who lives in an alternate world, flashes back in his mind.

As a reward for rescuing the kidnapped princess Flora, Rio decides to enroll as a special student to the primary school of Bertram Royal Academy. However, the students at the academy, where children of royalty and nobility gather, do not welcome the orphan Rio. The only person who cares for Rio, who is looked down upon by all around him, is Celia, a 12-year-old girl who is the homeroom teacher at the elementary school. Since Rio can't read, Ms. Celia and Rio begin tutoring alone after school.

Five years have passed since Rio was admitted to the Royal Academy, and the field exercises for his graduation exam are fast approaching. Celia has mixed feelings about Rio's resolution to leave for the Yagumo region, his parents' hometown, after their graduation. On the day of the field exercise, Steard loses his mind when the demons attack and push Princess Flora off the cliff. Without a thought, Rio dives in and throws Flora back onto the cliff in mid-air, while plummeting towards the bottom.

After saying goodbye to Celia and leaving the Kingdom of Bertram, Rio arrives at Amand, the trading city of the neighboring Kingdom of Garark. At the stall in front of the castle gate, there were dishes named "pasta" and "manju." Rio thinks that their creator, Liserotte, has the same Japanese memories as himself. After departing the city and entering the forest, Rio sees a girl who fell down. The moment Rio approaches and calls out, she opens her eyes to commit a shocking act.

Rio and Latifah enter an uncharted forest and are surrounded by a group of subhumans fast asleep. Just as Rio tries to talk with these so-called "Spirit People," Uzma, a winged beastman who thinks that Rio is the same beastman that kidnapped Latifah, attacks him without question. When Rio loses consciousness due to Uzuma's electric shocks, what appears in his dream is a strange beautiful girl with pink blonde hair and a childhood friend of Haruto Amakawa named Miharu Ayase.

A year has passed since Rio has lived in the village, and the day of the Great Spirit Festival has arrived. With the blessing of the tree spirit Dryas, Rio is recognized as a friend of the spirit people. The night of the joyous feast, Rio confesses to Latifah that he intends to leave the village. Latifah cannot accept this and runs off into the forest. Meanwhile, the warriors of the village detect some suspicious movement, which turns out to be a horde of Black Wyverns flying directly at them.