Incest Complex

Chikushodo Family is Big BiG BIG Noble Clan in the whole Japan. But Everything collapsed when a Large scale world war. My Grandpa, Granduncle, Father, Uncles, male cousins and My nephews all perished in the war. WAIT! How did that happened!?Over 90% of male population perished in the world. The War is savage and cruel. The War ended after 10 years. 7 billions male and female ended becoming...