 The whole point of sealing Inner Moka is to seal away her First Ancestor Blood, which is linked to Alucard's powers, and can only be removed by a person who truly cares for her, in other words, Tsukune.In the anime adaptation, Moka manages to bypass her rosary seal after Ruby mortally wounds Tsukune during the Witch's Knoll arc, the emotional trauma causing her Inner personality to emerge without having Tsukune remove the seal.Also, if willed on by Moka, it can hold back the awakening of Alucard.