I traveled through hundreds of worlds at once

In the intersection of the 18th and 7th school districts in the Academy City, on a street with few pedestrians.

A research institute that is at least a dozen years old and looks quite old stands here.

There is a huge and empty underground training room under this research institute. Yi Hui, wearing casual clothes, bandages on his eyes, and a headset, stands in the center of the training room.

There are circles of complicated and cumbersome slides around him, like a maze, and there are more than a dozen strange-shaped machines like guns on the slides.

In the observation window above the training room, several researchers in white coats are looking down from above.