On the way home from the convenience store, the boy Natsuki Subaru was suddenly summoned by another world. In a different world where he can't rely on anything, the only power in the hands of the powerless boy is... the power of "dying and starting over." In order to protect the most important people and to retrieve the irreplaceable time that does exist, the boy resists despair and bravely faces the cruel fate. (This new edition adds new scenes based on the first season of animation, and is made into a special episode with a single episode length of 1 hour in the form of merging 2 episodes into 1)