Senya Ichiya Romanesque

A man named Nozomu accompanies his younger sister to the country of Alusamito for a marriage interview with a prince, due to their family's financial struggles. The intended marriage partner is revealed to be Laud, Nozomu's childhood friend, who has grown into an arrogant and unlikable man. Concerned for his sister, who would become one of many wives, Nozomu is shocked when Laud suggests that he take her place instead.