Alisa was a marriage consultant in her previous life who reincarnates into the world of a popular game she loved. She is taken in by Kevin, the guild master, and works as a guild employee, using her former skills to provide marriage advice to adventurers. Her greatest joy in this harsh world is her devotion to her favorite character from the game, Prince Rubio. One day, she gets a chance to meet him, but the encounter takes a violent turn when Rubio appears covered in blood and his life is threatened by his own fiancée, Princess Selina. Rubio then suddenly declares that he will marry Alisa.

In the original game, Rubio was destined for an unhappy bad ending where he dies. Determined to change his fate, Alisa sets out to produce a happy marriage for her idol. She organizes marriage activity seminars, group dates, and matchmaking events for Rubio and other high-spec but romantically troubled men. As she works to find Rubio a suitable bride, she becomes increasingly entangled in the political schemes of Selina and her brother Evan, who plot against the prince. Meanwhile, Alisa's own feelings for Rubio begin to shift from pure admiration to genuine romantic love.

The story unfolds in a fantasy world of guilds, adventurers, and royal intrigue, with a full-color art style that blends comedy, romance, and light drama. Over the course of three volumes, Alisa uses her knowledge of the game’s plot and her coaching experience to guide Rubio toward a better future, while also confronting the danger posed by those who wish him harm. The narrative ultimately resolves with Alisa choosing to follow her own heart and stand by Rubio, leading to a happy wedding and the avoidance of the original tragic outcome.