In sixth grade, childhood friends Yukiya Asagi and Miku Sakura created a game with the objective to embarrass the other person by taking turns saying I love you. Four years later, even as they are entering high school, the two are still trying to one-up the other and claim victory. However, as tender feelings begin to bloom in their hearts, the simple phrase has taken on new meaning beyond the rules of their game. With the passing of each day, the urge to become more than childhood friends grows—but both Yukiya and Miku resist making the first move, hesitant about what is in store once the game finally ends.

On days when Sunao is sick, or not feeling like going to school, she is called to take her place. She was born to this world when Sunao wished to have a substitute. No one knows that she exists, but she tries to do her best for Sunao whenever she is called. One day she talks with Sanada, one of her classmates. They become friends, but soon he notices that she is different from the original Sunao...he was the first one who did. She tells him to talk with her only when she has her hair half-up. Sanada does like she told him, and they enjoy their time together. As they become closer, she realizes that she has special feelings toward Sanada. But she doesn't know what will happen to her...if she, a replica, falls in love. (Source: Kadokawa)

In his past life, Prince Lloyd de Saloum was a commoner who could not become adept at magic, no matter how knowledgeable or obsessed he was about it. Now reincarnated into his current royal lineage, he receives a body with seemingly endless mana, making his desire to master all things arcane attainable. Moreover, as the seventh prince of the kingdom, Lloyd has no claim to the throne, allowing him to nurture his abilities as freely as he wants. Unfortunately for Lloyd, ancient seals that imprison powerful demons begin to break down and release the horrors within, endangering the peace. With these monstrosities roaming around, Lloyd's overwhelming magical prowess is the ultimate weapon that can neutralize these threats before all things descend to chaos.

Thirty-five-year-old novelist Makio Koudai never had a good relationship with her older sister Minori, who always berated her for being different. Due to this, Makio is not stricken with grief upon hearing the news that Minori and her husband died in a car crash. But when Makio is asked to identify their bodies, she runs into her 15-year-old niece, Asa Takumi, whom she has not seen in years. As Asa struggles to process her parents' death, Makio reassures her that her complicated feelings are valid and suggests that the teenager start writing in a diary as a way to cope with the loss. Upon learning that no other relatives wanted to take in Asa, Makio decides to become her guardian despite her lack of experience. In a world full of uncertainty, the novelist and teenager must learn to live with each other while figuring themselves out.