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 the fact that you 
were at the center of it.
وكونك كنت في مركزها
Und die Tatsache, dass du
im Mittelpunkt davon stehst.
Que usted estaba en el centro de todo.
Que usted estaba en el centro de todo.
Vous étiez au centre de ce projet,
et il a échoué.
E il fatto che lei ne fosse al centro.
E o fato de que você estava
no centro disso.
Помню, что вы говорили, 
профессор Юко, и что она провалилась.