The Holy Grail of Eris, Vol. 1 (manga)

Connie is a viscounts daughter with little notable attributesbesides her sincerity, so when shes suddenly framed for a crime shedidnt commit, it seems like the end of the line for heruntil theghost of Scarlet Castiel, an infamous villainess who was executed ten years ago,swoops in and clears her name. In exchange, Connie resolves to solve the mysterybehind Scarlets untimely death...and in the process, uncovers aconspiracy that still haunts the present!