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?
Their spirit, which has been passed 
down since ancient times.
.روحهم، والتي توارثوها عن أجيال منذ زمن بعيد
Ihr Geist, der seit Urzeiten überliefert wurde.
El espíritu que se ha legado
desde la antigüedad.
El espíritu que se ha legado
desde la antigüedad.
Ces choses qui nous ont été transmises
à travers les âges.
Il loro spirito, che è stato tramandato
 fin dai tempi antichi.
Proteger seu espírito,
transmitido desde os tempos antigos.
Дух, что с древних времён передавался им.