Echoes of Time and Space in Another World

An amnesiac boy travels through a different world, and with seven interracial partners, they fight each other to support each other in life and death. They went from conquering mountain giants to conquering giant beasts in the world, from escorting caravans in the black forest to climbing to the top of the Babel Tower in the sea of ​​starry sky and clouds. As the journey progresses, Allen discovers that his time travel is no accident. He is the "Key to Time" selected by the Tower of Babel. The real enemy is another self from parallel time and space who has lost all his partners. The journey made him understand: the real value is the person who is always with you.