Killer's Familia

Baal and Levi are members of the "Hornfolk" warrior race. The man who adopted them runs an organization of assassins but lives in constant fear of their sheer destructive power and complete lack of ethics. Good thing Baal and Levi love the boss! Nevertheless, the boss wants them dead! A pseudo-family battle comedy filled with plenty of affection, bloodlust, monstrous beasts, and monstrous people♪

(Source: Square Enix, translated)