The male protagonist and the female protagonist are twins. After a class reunion in the previous life, when the female protagonist was crossing the road, a Universiade truck came out. The male protagonist was afraid that the female protagonist would steal his chance to travel to another world, so he pushed the female protagonist away. As a result, he was awarded the title of a member of the time-traveling army. The female protagonist watched the male protagonist snatch her spot and ran directly to the rooftop. As soon as they jumped down, they became a member of the time-traveling army, and the two of them traveled back to the first grade of junior high school. The writing in the front may be a bit slow, but it is not particularly exciting, mainly in the back.
