My sister and I are not blood related

“Does it matter what we’re doing now? Whatever the reason, we’re still siblings in the family.”

My little sister, Kururi, is a brocon to the extreme.

Whenever our eyes meet, she’s so attached to me, always crying to sit on my lap or hold hands with me.

“Hehe. Onii-chan, I love you!”

Kururi smiled mischievously, at night, she entered the same room as me.

During dinner, our parents revealed a shocking truth to me, which even Kururi herself didn’t know.

“Kōsetsu-kun and Kururi-chan are not related by blood.”

Wait, Kururi and I are stepsisters!? That would be a bad thing…

“If we weren’t siblings, that way, I could marry Onii-chan!”

My little sister was always the type to say things like that!

The relationship between a serious older brother and a half little sister who is affectionate as a family begins to change with this hidden secret!