Katsuki is a very popular guy when in school but when he comes home he is quite different. His mom works in a lab that does horrible tests on animals and people. He's seen the people in the lab before and it was horrendous. He struggles to sleep often and his mom is starting to notice.

Today she decided that maybe Katsuki needs a 'pet'... She drove him to the lab and took him to a corridor with windows at both side. This was supposed to hold the calmer and more affectionate of creatures but some were a bit scary. He walked to the end of the corridor and saw a little dove sat on a perch. He felt a strange connection with the creature.