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?
Find a way to fit fifteen billion 
semiconducting parallel computing circuits
اعثري على طريقة لوضع 15 بليون دوائر حوسبة
 متوازية شبه موصلة
Finde einen Weg, fünfzehn Milliarden
halbleitende, parallele Schaltungen
¡Que 15 000 millones
de procesadores paralelos
¡Que 15 000 millones
de procesadores paralelos
La miniaturisation
de 15 milliards de multiprocesseurs
Deve far entrare 15 miliardi di circuiti semiconduttori 
per il calcolo parallelo nel palmo di una mano.
De quinze bilhões de circuitos
semicondutores de computação paralela
Пятнадцать миллиардов полупроводниковых
 параллельных вычислительных схем