The Holy Grail of Eris, Vol. 8 (manga)

Connie and Scarlett's quest for revenge fifinally leads them to the doorstep of Aisha Huxley, the woman who was once Scarlett's avid fan. Facing interrogation from the girl-and-ghost duo, Aisha is backed into a corner...and at last, she reveals the truth from ten years ago. But her answers only bring about more questions, and as Connie delves further into the mystery, Lily's cryptic clue-"The Holy Grail of Eris"-resurfaces with a surprising new meaning...