Oka is Recca's father, as well as Kurei's. Oka was the leader of the Hokage
ninja clan who died during the war in order to keep the madogu safely out of enemy
Kagero is Recca's mother. When Kurei was going to be killed, she begged for
him to be spared. She got her wish and instead Kurei and his mother became outcasts.
Later, Kagero used a time spell in order to send Recca into the future to save his life.
As punishment for using that spell, Kagero was cursed with immortality. When she finally
found Recca she called herself Kagehoushi and acted as his enemy. Eventually she
would reveal the truth to him. One of Recca's goals is to remove the curse of immortality
Kurei is Recca's older half brother. When they were little, Kurei was
seen as one with the cursed flame. Because of that he was ordered to
be killed so that Recca would be the heir instead of Kurei. His life
was spared thanks to by Recca's mother, Kagero. Kurei and his mother
became outcasts and Kurei was bullied. Kurei decided that all of his
and his mother's suffering is because of Recca, so he tries to kill him.
The Band-Aid on Recca's cheek covers the scar left behind after Kurei stabbed
him. When Kagero used the time spell to send Recca into the future, Kurei followed.
He was adopted by Koran Mori. Kurei tried to hide his feelings for Kurenai but Mori
saw through his act and killed her by detonating a bomb that was inside her.
Kurei used his flame, the phoenix, to turn Kurenai into a living flame.
Kurenai became an angel of fire. The only reason Kurei follows Mori is
because Mori put a bomb similar to the one put inside Kurenai into Mori's wife
who Kurei cared about as if she were his real mother.