Arakawa Kouki is reincarnated to a Japan with a different history than the Japan he knows, with the memories of his previous life still intact. Kouki was discouraged, "Aren't reincarnation stories supposed to be at some fantasy world filled with swords,

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The story follows Lana, who lives in a country where every person is granted a skill by the queen on their 15th birthday. Lana is given the skill "Breathing" (Kokyū), a skill he has never heard of, but he has always dreamed of diving into a dungeon as

65 million years ago, Earth was ruled by all sorts of dinosaurs—from big to small. In the Quaternary Period of the Cenozoic Era, humans became the Earth's rulers. Unfortunately, a great deal of humans from their birth to death can only make use of 3