Ep 23. His Butler, Up in Flames

In the season 1 finale of Kuroshitsuji, titled "His Butler, Up in Flames," the Phantomhive household is in shambles as Sebastian desperately searches for his master, Ciel, who has been kidnapped by the villainous Ash Landers.

Meanwhile, Ash reveals his true identity as the leader of a cult intent on summoning a demon and acquiring immortality. He plans to offer Ciel as a sacrifice to achieve his goal, leaving Sebastian with the daunting task of rescuing his young master before it's too late.

As Sebastian fights his way through Ash's followers and confronts the cult leader himself, the truth about Ciel's past and his connection to the Phantomhive family's dark history is finally revealed.

With the stakes higher than ever and the fate of the Phantomhive household hanging in the balance, "His Butler, Up in Flames" delivers a thrilling conclusion to the first season of Kuroshitsuji.