Origin of Blood

On an alternate Earth in 2160 the environment almost became uninhabitable because of pollution and degradation of nature. The world govt was formed as all countries joined but it all changed in 2180 as things took a turn for the better as a new element named mana appeared on the planet. But all was not good news as not just humans but other creatures evolved with the appearance of Mana. But what if mana was not something new, what if it existed on the planet a long time ago? Now, 20 years after mana appeared and its density continued to grow, with the world's recovery, a few students from the World Sciences Academy set out in search of a piece of history and uncover a legend that changes the fate of their world and more.