Responses
The brother doesn't get a spin-off, but one of the kids who attacked him do.
Here's the link: https://myreadingmanga.info/yoha-sayonara-koibito-matakite-tomodachi-lost-child-kr/
I have really mixed feelings about this, I just hope that the brother gets a spin-off so that we can see an alpha being kept like an omega... (￣∇￣")