Akuyaku Reijou Tensei Ojisan

Fifty-two-year-old civil servant Kenzaburou Tondabayashi is struck by a car and awakens inside his daughter's favorite game as Grace Auvergne, the arrogant villainess whose role is supposed to make the heroine's life miserable. Familiar with the basic rules of these stories, he resolves to perform Grace's part properly.

The problem is that decades of being a father and responsible adult are stronger than his acting. Instead of insulting people, he speaks politely, encourages students, and solves problems with mature consideration. Grace quickly changes from a hated rival into one of the academy's most admired girls, including among characters who were meant to oppose her. Every attempt Kenzaburou makes to restore the 'correct' route only pushes the story farther away from it.