Various! Genderbend! Villainess Level 99 x Reincarnated Princess! OP! Oc Insert

The beginning of Light Magic and the Hero, an otome RPG, unfolds fairly normally: the hero, Alex Ehnleit, meets his three love interests one after another and then inevitably comes face-to-face with the villain in order to save the damsel in distress, Princess Yume. Yumiello Dolkness may be of noble descent, but his dark hair and rare dark-type magic, both associated with the Demon Lord, spark fear in anyone who sees him.

When he is five years old, Yumiello regains memories of his previous life in modern Japan, also realizing that his fate is to become the hidden boss that appears after re-capturing Yume after Alex and his suitors defeat the Demon Lord with the group saving the princess from him. Yumiello refuses to live as the game dictates and, as he prefers the game's fantasy elements over its romance, he decides to cultivate his magical skills and level up in secret.

However, everything falls apart on the day of the Royal Academy's entrance ceremony. Yumiello's powers are measured at level 99, something thought impossible even for the royal knights, let alone a 15-year-old boy.

Also, on that same day, Yume's powers were revealed to be 100 (making her relatively more powerful that Yumiello), impressing a bewildered Yumiello, but the young princess secretly hates this news. With the royal family requesting both their help, and everyone else insisting that they prove their strengths, they realize their dreams of a quiet life is no longer an option.