Shirogane Takeru found himself inexplicably transported to a world that resembled his own in many ways, with one major difference: For nearly 30 years, mankind has been at war with the alien BETA, who have succeeded at wiping out over half of humanity and had nearly captured the entire Eurasian continent. As Takeru tried to come to grips with this bizarre new reality, he realized too late that the majority of humanity will be abandoned with the Earth, as the chosen few escape to the stars, hoping to find sanctuary.

Now, equally inexplicable reasons, he finds himself returned to the first day of his time in this alternate world. Will the experiences and knowledge he has gained allow him to make a difference?
And now that I think of it, I must've been 
a real burden to them in the other world.
والآن بعد التفكير في الأمر، لا بدّ أنني كنت عبئًا ثقيلًا
 .عليهم في العالم الآخر
aber in der vorigen Welt muss ich
den anderen wirklich Probleme bereitet haben.
Ahora que lo pienso, seguro que fui
un lastre para todas la última vez.
Ahora que lo pienso, seguro que fui
un lastre para todas la última vez.
Je me rends compte que je devais
être un sacré boulet dans l’autre monde.
E ora che ci penso, devo essere stato davvero 
un peso per loro nell'altro mondo.
Pensando nisso, devo ter sido um
verdadeiro fardo para todos no outro mundo.
Но в прошлый раз я сильно тормозил отряд.