At year 3021, Akino Kylei, a detective, and Alexa, her adopted daughter, got caught in a huge explosion of unknown origin. The next thing they knew was they woke up in a huge room full of empty ‘seed pods’ looking structures. Much to their surprise, their bodies have turned into something else and the world they knew became deserted ruins covered in alien flora and fauna, with no single human shadow to be found. Investigating further, the detective and her daughter discovered that one million years have passed since the explosion they got caught with, the whole world has turned into a highly radioactive environment, and a strange stationary ‘void’ appeared below the north star Polaris.
The two accidentally went into the void, finding themselves in a strange world, and as they begin surveying that world, they saved a demi-wolf named Lyka from some attacking 'knights'. Lyka thanked the two otherworldy humans by going in a pact between them, and so the three embarks on their journey. Lyka guides Akino and Alexa in her world called 'Elyn', becoming adventurers, and resolving many conflicts. They travelled in that world and experiences many things, all the while slowly discovering some vague information about the so-called Institution, a secretive organization from Akino and Alexa's world, and has left considerable amount of evidences of their existence in Elyn, leading to more questions as to what really happened on that day the Earth was wiped-out.