Nei You was the founding master of You household, his family has been the one who serves the Tanmoku Family, Keika You is his direct descendant.
Appearance
Eyes = Dark
Hair = Black
History
He is the one who acts as guardian for Rakugetsu They have a brother relationship, but he acts that he was his master, and he is the one who killed Rakugetsu and cut his own hand to make Rakugetsu Sword.