For the large golden retriever Ryota, Red Team, and Gonggufeng
The female character in the bg story is Ryota's biological sister, Kise Ryoyu
The biological mother and stepmother are undecided
In short, it's a cute story about Kise's father poking Ryota's little tail to prevent him from following his sister's home campus and the stadium.
The first article is cute and joyful, the second article is slightly sadistic
Both sad and happy endings.