Alize, born into the Earl Gilbert household, possesses memories of her previous life.

According to Alize's memories, this world is from a BL novel (with incredibly absurd content) she read in her previous life. Her older brother, Clovis, falls into a forbidden love with the protagonist, Duke Yoel Anglade, and elopes to another country to pursue their love.

And Alize, who relentlessly bullied Clovis, ends up marrying the Marquis Bettini, forty years her senior (who is beyond bear-like, just plain fat), as a 'comeuppance factor'.

To avoid such a tragic future, Alize struggles.

As a result, her brother Clovis becomes an extreme siscon.

And Alize, for some reason, commits a one-night mistake with Yoel under the influence of alcohol?!

Afterward, Yoel proposes to Alize, but Clovis vehemently opposes it... leading to an unprecedented situation where the original protagonist and heroine are at odds.

Alize also rejects the proposal, wishing to avoid troublesome situations, but she gradually finds her heart swayed by Yoel, who approaches her with his full "protagonist aura."

Ultimately, who is this world for? This is a story about that. (Probably)

※This is a revised & augmented version of a story previously published on another site under a different name, titled "My Brother Is Supposed to Be the Heroine."

※BL elements are almost entirely absent except for explanations of the original work.