Saikyou Ou Zukan is a simulation picture book series, it is a battle to determine the strongest creature of all in the animal kingdom. So far, the battles take place in the realms of "animals", "extinct creatures", "dinosaurs", "yokai", "insects", "monsters" and even "underwater" to determine the number one. The battles have extended to the "myths", and "dragons" and the latest book "Eiyuu Saikyou Ou Zukan" has been a massive hit since its release! The momentum never ends!