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?
This is a work of fiction. Names, characters, places and incidents
 either are products of the author's imagination or are used fictitiously.
هذا عمل خيالي. الأسماء والشخصيات والأماكن والحوادث
 إما هي نتاج خيال المؤلف أو يتم استخدامها بشكل وهمي
Diese Geschichte ist Fiktion.
Sämtliche Personen, Gruppen usw. sind frei erfunden.
Esta es una obra de ficción y no guarda relación alguna
con personas u organizaciones de la vida real
Esta es una obra de ficción y no guarda relación alguna
con personas u organizaciones de la vida real
Ceci est une œuvre de fiction.
Les personnages et organismes décrits
sont purement fictifs.
Questa è un'opera di fantasia. Nomi, personaggi, luoghi e incidenti 
sono il prodotto dell'immaginazione dell'autore e applicati in maniera fittizia.
Esta é uma obra de ficção. Qualquer semelhança com nomes,
pessoas, fatos ou situações da vida real é mera coincidência.