You get reincarnated into a raising sim as the character who was supposed to die, and your favorite character is now your stepbrother, and the game's entire design is built to make you fall for him anyway. The show knows the cruelty of that setup and leans into it. You're not fighting the game's romantic logic, you're trying to survive it while your favorite gets all the reasons to love you back, and you have to decide if protecting him means staying alive or letting the script win.

Alba is reborn inside a raising simulation game as the son of a poor nobleman, the younger brother whose story was meant to end in death. A disease keeps him from using magic and dooms him to a short life, so the duke's family takes him in. There he meets Orsis, his favorite character from his past life and now his older stepbrother. Remembering that he is the reason Orsis lost his smile, Alba searches for a way to live a long life so he can keep doting on him in this fantasy romance.