Kakuzukesareru Sekai de Ikiteiku

When Yuuta wakes up, he finds himself in a new body with most of his memories intact. It’s a world with a man to woman ratio of 1:10,000, rebuilt from the ashes of the old world – our current, modern world. Naturally, men are treated as precious by each country, and they’re provided everything they need for living. But that comes at a price. Men have obligations and they are but one cog in a society of females which follows strict rules and adheres to a harsh class-based ideology and traditions. Source: France Shoin