Murciélago 18.

After putting Zenpachi out of commission, Sendou’s off to kill the lady of the house. When Hikaru gets in his way, he finds himself switching targets. But after Kurono awakens inside Hikaru’s body to guide her sister’s blade, Hikaru’s aura alone is enough to make Sendou quiver in fear! With Hikaru’s life on the line and a crazed Sendou desperate to survive, who will come out on top?