A young man who adored a character from an otome game in his previous life is reincarnated into that very game world as Alba, the frail son of an impoverished noble family. Due to his poor health and inability to use magic, Alba is taken in by a powerful duke's family, where he discovers that the duke's son, Orsis, is now his stepbrother and is the exact character he once loved. Alba’s joy at this reunion is quickly overshadowed by a grim memory from the game’s plot: his new character is a minor role fated to die young, a tragic event that causes the usually cheerful Orsis to lose his smile and become a colder person.

Determined to avert this destiny and spend a long life doting on his favorite character, Alba resolves to smash every "death flag" that surrounds him. Using his foreknowledge of the game’s storyline, he searches for ways to extend his life and change the future, all while openly adoring his new stepbrother. The series follows Alba’s efforts to survive and alter the fate that binds them both, turning a story of tragedy into one of devotion and second chances.