Elhanburg No Tenshi

Madeth and Lalvan successfully obtain a castle but it seems that there is a rumour going on around that says the castle is haunted by a spirit. The spirit is actually an angel that blesses kings that are currently ruling the land of good fortune and that he will be loved by all the people of the land. He will also be most likely ruling the land for a long time.
However, one day, the appearance of a lady has stirred conflict between the two good friends. What will happen to the relationship of Madeth and Lalvan?