Era of the Eldest Son

Hayato Kuno, a man who chose to become a hitman to support his family as the eldest son after his father committed suicide. In a world like this, the only people who can believe in each other are family members, and it is the eldest son who must endure, never dreaming! What is reflected in Hayato's eyes as he faithfully carries out his orders and lives only in the present reality...? A violent action manga with soul!