The Cooliest's manga / #Animal Characteristic(4)

Honestly liked this story more than the main story. Like the seme. Loved the backstory of the uke.

Part 3. I still don't get how this gets a 9.something. I mean it's alright??? But nothing's really going on? Maybe it's just the smut, I guess.

Animal-Human hybrids travel to Earth to find more info about it. Two childhood friends turned enemies are tasked to do the research.

World has humans and humans with extra animal characteristics. They go into heat and such. About a tsundere doctor who treats this alpha patient who is the director (?) of the hospital.