The Seventh Sign: Mr.Sister Final by Sweet and Tea - Adult Sex Game

Overview:
“Good morning, sis!”
Vividly blonde hair and cat ears — the beloved half-sister, Aoba Erika, once again visits the room of Reiji — her male sister. Yes, male. Reiji is her older brother, unquestionably a man, but he is also her older sister. And her cat ears are indeed the genuine article — ones that appear and disappear thanks to a certain impetus, and can’t be taken off. There are certain, complicated circumstances that led to this, but Reiji himself has accepted it. He neither corrects her, nor does he speak effeminately, as he continues his life.

Regardless, this isn’t exactly the daily routine of the Aoba household.
Obviously a sister should refer to her brother as a brother, and her cat ears shouldn’t even exist.

Once I resolve the problem of the fragments of divine power within me,
the issue with Erika should be resolved as well — so Reiji thinks to himself in distress, once again.​