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Before Dr. Butterfly dies, he explains that a man named Victor is inside the flask and that he is a being far superior to humans and Homunculi. Kazuki destroys the flask and engages Victor in battle and is seemingly killed after having his kakugane destroyed. Kazuki regains his kakugane which is revealed to be a black kakugane, causing him to transform into a being like Victor with glowing light green hair, red eyes, and tanned skin.
Episodes
1A New Life 2The True Form Homunculus 3You've Become A Little Stronger 4Another New Life 5To Protect Someone 6The Butterfly of Black Death 7Whether or not You're a Hypocrite 8A Night in the Dorm 9The Hayasaka Twins 10It Seems We're Well Matched 11Till Death Do Us Part 12Carnival 13Signs Of Death 14Who Are You? 15An Intermediate Existence 16New Strength 17When Dawn Comes 18The Escape 19As Long As I Can Protect You 20With Strength And Spirit 21Gone Into Flame 22A Decision Is Required 23Boy Meets Battle Girl 24When You Die, I'll Die With You 25No One Could Ever Take His Place 26Period