From Superfan to Stepsister

Oshi ga Ani ni Narimashita
推しが兄になりました

Source

My Bias Became My Older Brother
Oshi ga Ani ni Narimashita· 推しが兄になりました
manga

* Note: This is a promotional short series.* A story of a girl's favorite model who becomes her older brother. [Original Web Comic](https://www.pixiv.net/user/4778293/series/103427)