After a fierce battle, Magic swordsman Kyle finally killed the Demon Lord after being seriously injured in the battle. Kyle on the verge of death approaches a relic which was in possession of the Demon Lord and it sends him to the past. After recovering from the initial shock, he decides to use this opportunity to avoid making the same mistakes of the past and become stronger.

Lua is a saintess candidate who possesses the power of healing. But her ability had one flaw: she could only heal others by transferring their wounds onto herself. Because of this, others bullied her, calling her the "Fallen Saintess." But it didn't bother Lua because her best friend Arianne always stood up for her. One day, Lua's crush, Commander Garrett, was on the brink of death from a beast attack. Lua healed him, which left her on the verge of death. When she woke up, she learned that all the credit was given to Arianne, and she finally saw her best friend's true color. Devastated, Lua is lost and helpless when the second prince appears in front of her with a tempting offer. What would happen to Lua as she begins her new life as a villainess?

Takeru Narihira is a lone wolf delinquent who spends his days getting into fights, avoiding friendships, and being captivated by a mysterious girl named Tsukimiya—someone he's only ever seen in his dreams. One day, a sudden accident sends him tumbling off a cliff. When he regains consciousness, he finds himself in Denji Heian-kyou, a futuristic version of the ancient capital, where advanced technology and mysticism coexist. This world is under the protection of the legendary onmyouji, Abe no Seimei—and to Takeru's shock, Tsukimiya is real and living in this very place. Just as he begins to revel in this fated encounter, a deadly black mist known as Yamikaoru descends, bringing forth monstrous beings called Oni. In the chaos, both he and Tsukimiya are killed—only for Takeru to awaken once again in Denji Heian-kyou. Realizing he has somehow slipped through time, Takeru resolves to defy fate. To protect Tsukimiya from her doomed future, he turns to Abe no Seimei to train in the art of onmyou-jutsu. Now, as an onmyouji himself, he must fight to rewrite destiny and uncover the truth behind this strange new world.

As the son of the late legendary actress Subaru Ayase, Yuu has had many expectations placed upon him after he transferred to Saika Academy, a highly prestigious school where students can hone their personal talents. However, in contrast to his mother, Yuu is completely talentless. Being seen as completely mediocre, he would have no chance of standing side by side with the three emperors of Saika Academy: the Mikadono sisters, Miwa, Nico, and Kazuki, who are each prodigies in shogi, martial arts, and performing arts, respectively. With Subaru's friend agreeing to take her son in, Yuu aims to fulfill his mother's last wish to him, which is to build a happy family, after never being able to form a proper mother-son relationship due to their difference in talent. As it turns out, his mother's friend is actually the father of the Mikadono sisters! Keeping his mother's wish in mind, Yuu aims to build familial bonds with the siblings. However, due to their extreme focus on their respective specializations, they show little interest in opening themselves up not only to him, but to each other as well. Nonetheless, Yuu strives to continuously support the three prodigies, as his kindness and care restores the bond between the sisters.