An uninvited British maid, a thrilling race against time.

On his eighteenth birthday, celebrating alone, Ion suddenly learned a shocking secret—his biological father was actually the Archbishop of Heaven's Mandate, Otto Apokalis!

"The Archbishop has said that you will inherit the position of the next Archbishop of Heaven's Mandate. But before that, I will train you to become a qualified successor to the Archbishop," said the elegant maid, Rita Rossweisse, who knocked on his door.