Johannes Kleeman or his alias and preferred name, Hans Lee (ハンス・李, Hans Lee), is a half-devil, half-human hybrid. He is a rather carefree person, unbothered even by blood. By drinking controlled dosages every morning and evening, he has managed to almost completely control his bloodlust. He is a part of the 15th Hybrid Birth Project at ONLO in Hokkaido, where he was born and raised. He was raised at the same facility as Yuuki Anzai, although not the same group. It appears that his departure from ONLO wasn't authorized. An unofficial member of the F Squad, Lee began acting independently after the squad's disbandment and came to be known as "The Silver Wolf" due to coincidentally saving devils in need. After being sighted by Kaname Shirase, Lee agreed to become a poster child for a movement to bring humans and devils together. However, freedom being the only thing he yearns for, Lee soon quit this role, as he only wants to be with the F Squad, whom he considers his family.