Strike the Blood: The Progenitor's Trial

To seek revenge and save the world he cherished, Cain made a pact with the Counter Force of another world before he died, allowing him to be reborn.

Natsuki Minamiya: Kojou! You're such a troublemaking kid!

Nagisa Akatsuki: Kojou! You haven't done anything to betray me, have you?

Yukina Himeragi: Senpai! Have you been drinking other girls' blood again?!

This is the trial of a young man who must wield his powers with care, temper his mind, and become a king.

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Gate of Babylon + True Ancestor's Beast = Invincible