But at some point, he lost all restraint...

He started going after healthy kids, too.

The goal changed from "treatment" to "enhancement."

......From the beginning, Sensei believed that "strength is justice." Looking back, his research on the heart may have been connected to that.

In order to give the kids superhuman abilities, he even destroyed and modified their eyes and ears.

...Were the surgeries successful?

Yeah...... Well, generally speaking... we haven't been conducting as many risky surgeries lately. Our main focus has changed to drug research.

Sensei probably wants to avoid a situation where room 13 gets too crowded...