Gasha Inui used to serve for the military at the age of 27, he was trauma from the war and decide to left the corps. After 5 years and Inui has turned 31 years old and still single and the past 5 years Inui been teaching and taking care of the orphans.
Inui suddenly got a mail from the corps he used to serve at and he was shocked knowing the corps offer him to serve the military again due to his braveness 5 years ago. But here come the bad news, he had to meet all his old friends he used to work with and he was scared that they would judge him for being a coward, after this he gladly rejected the offer. On the next day the same mail came again and he reject it again and the same mail came again and this goes on and on until he finally accept the offer. He decide to go to the place he was told too and the first person he saw was commander Tsukasu. Inui was praised by commander Tsukasu for his braveness 5 years ago. After that he decide to take around the place he was surprised to know his great friend June are still serving there even after losing his right arm, knowing this Inui got the motivated to serve for the corps once again even after going through a trauma from the battlefield 5 years ago, also know as 'The Zero Progress'.