I'll Live a Long Life to Dote on My Favorite Stepbrother!

I'll Live a Long Life to Dote on My Favorite Stepbrother! is a fantasy romance ONA that concluded its run with twelve episodes in winter 2026. The series follows a player who finds himself reincarnated into a simulation raising game, but with a twist—he appears as the younger brother destined to die, while his favorite character from the game has become his older brother-in-law. This premise inverts typical isekai expectations by casting the protagonist in a doomed role from the start.

The story centers on the player's struggle to protect and support his beloved character while navigating his own mortality within the game's logic. Rather than focusing on power progression or conquest, the narrative explores what it means to live meaningfully within predetermined constraints and to build genuine connection with someone you cherish. The chemistry between the brothers forms the emotional core, grounding the fantasy premise in character-driven storytelling.

Since the series has finished airing, all twelve episodes are available to watch in full. The compact episode count and ONA format make it accessible for viewers seeking a complete story arc without the commitment of a longer series.