Muvluv Unlimited. One day Shirogane Takeru wakes up late, wondering why he wasn't wakened by Sumika or Meiya that morning.
He gets a little nervous, not seeing any signs of them, and goes out of his house only to see the city he lived in ruins all his life, and that there are real life giant robots, to his joy.
He convinces himself after getting past the initial shock that it must be a dream and decides to enjoy it as much as he can. Still skeptical of his situation, Takeru decides to join the army to pilot a mech.