The beginning of Light Magic and the Hero, an otome RPG, unfolds fairly normally: the heroine, Alicia Ehnleit, meets her three love interests one after another and then inevitably comes face-to-face with the villainess. Yumiella Dolkness may be of noble descent, but her dark hair and rare dark-type magic—both associated with the Demon Lord—spark fear in anyone who sees her. When she is five years old, Yumiella regains memories of her previous life in modern Japan, also realizing that her fate is to become the hidden boss that appears after Alicia and her suitors defeat the Demon Lord. Yumiella refuses to live as the game dictates and, as she prefers the game's fantasy elements over its romance, she decides to cultivate her magical skills and level up in secret. However, everything falls apart on the day of the Royal Academy's entrance ceremony. Yumiella's powers are measured at level 99—something thought impossible even for the royal knights, let alone a 15-year-old girl. With the royal family requesting her help, and everyone else insisting that she prove her strength, Yumiella realizes that her dream of a quiet life is no longer an option.

Akutsu Masatora is a demon who has infiltrated a high school in the human world. His goal is to find candidates to aid Hell in the fight against their natural enemies, the angels of Heaven. Assigned a seat next to Lily Amane, another student who transferred here not long ago, Akutsu falls prey to her beauty and decides to recruit her to his cause. But there's more to Lily than meets the eye, and Akutsu not only finds himself an accomplice to one of the very enemies he is supposed to defeat, but he also might have developed feelings for her.

Having just moved from Tokyo to Hokkaido, high school student Tsubasa Shiki decides to explore the picturesque winter landscape he could never experience in the nation's capital. It only takes a moment for Tsubasa's idealized view of Japan's northernmost prefecture to crumble, as the sheer cold and frigid air quickly overwhelm him. While trying to find the way to his new home, Tsubasa runs into Minami Fuyuki—a talkative and friendly Hokkaido native who, despite the cold, is wearing a short skirt. The girl wastes no time in striking up a conversation, and Tsubasa comes to realize that the winter weather is not all that is too much for him to handle. The next day, Tsubasa is shocked to learn that not only is Fuyuki in his class, but her seat is also right next to his. Swept along by Fuyuki's persistent advances, the young man soon becomes captivated by both life in Hokkaido and the beautiful girl determined to get closer to him. As he deepens his relationship with Fuyuki and meets other fashionable girls from his school, Tsubasa finds out that Hokkaido gals truly are adorable.

The princess who's been held captive by the Demon Lord's army is scheduled to be executed by the Demon Lord's relentless torture!