One day, suddenly, I was reincarnated as a character called Zero, the secret boss of an action RPG game called ‘Fantasy War Game’, In the end, said character is doomed to be killed by the game’s female protagonist, which is a tragic fate. That’s no joke! With great determination, I headed for the beginning village where the female protagonist was living, hoping to kill her before she kills me, but there I accidentally saved her from being attacked by a monster. As a result, the strongest Yandere female protagonist falls in love with me! The secret boss, who wants to survive at all costs, develops various survival strategies in the academy against the strongest Yandere female protagonist. It all revolves around a variety of people. …… This is the story of Zero, the secret boss, who changes the scenario with his survival strategies against the troublesome Yandere female protagonist and her friends.