Searching for a guro manga.
Takes place on an island castle. Filled with girls in what I think are ninje/zentai clothes. There's and old ugly man who fucks a redhead to death, she is not to pleased about it. One by one he assaults and kills them but I guess they're his servants or something? In the end the castle collapses killing everyone. The last panel is of a giant tombstone crushing the island.
>Pic unrelated