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?
If it wasn't clear, I was training. 
I try to make a habit of it.
.إن لم يبدُ الأمر واضحًا، فقد كنتُ أتدرّب. أحاول جعلها عادة
Das, wonach es aussieht.
Ich hab trainiert.
Exactamente lo que veías.
Entrenaba. Acostumbro hacerlo.
Exactamente lo que parece.
Entrenaba. Suelo hacerlo.
Je m’entraînais, comme tu vois.
C’est ma routine.
Se non fosse chiaro, mi stavo allenando. 
Stavo cercando di renderla un'abitudine.
Como pode ver, estava treinando.
Faço disso um hábito.
Как видишь, тренировалась.