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?
I'm honestly surprised 
I said something like that.
.يفاجئني أنني قلت شيئًا كهذا
Ich hätte ehrlich gesagt nicht gedacht,
dass ich so etwas sagen könnte.
La verdad, nunca pensé
que diría cosas como estas.
La verdad, nunca pensé
que diría cosas como estas.
Je me surprends moi-même
de dire ça sans embarras.
Sono davvero sorpreso 
dalla risposta che ho dato.
Estou bem surpreso comigo
por dizer tal coisa.
Я это сказал? Сам себе удивляюсь.