He's My Only Vampire, Vol. 9 (Volume 9)

"To think that sharing her with you would let me experience such unthinkable highs...!"
At long last, Aki has regained his memory. However, he and Kana are faced with a painful truth--all along, Kana has actually been Eriya's thrall! Amid the chaos, the final Stigma appears, and the bloodred ties that bind the players in the game tighten to a stranglehold!