Hello, I've forgotten the name of a very good yaoi series I read a long time ago. Its about this over weight child(seme) that is bullied, but he goes to a 'boarding school' which isn't a boarding school at all. Its like a prison or a research facility where they conduct experiments on a whole group of clueless overweight children. Things like running away from a cheetah to wrestling bears and snakes. Wild man stuff that ordinary people would be incapable of doing. When the experiment ends, they are all thin and beautiful and most of all...sadistic. They are crazy strong. The uke goes back and meets his bully (or someone who defended him, but Im pretty sure it was his bully) and become a thing. It is much appreciated if someone could help me. I've tried everything. Please and thank you for your time.

I think it's Aitsu no Daihonmei

Thank you so much, I would have never found it. 😀