Yuri. Interstellar Legend

What can a mechanical repair soldier do? Research, modify, and have imaginative ideas? What can a mecha warrior do? Fight in mechas, perform exquisite operations, and use strange tactics? What can a special reconnaissance soldier do? Penetrate deep into enemy territory, engage in unarmed combat, defeat the enemy with one move, disguise, sneak, and snipe? What can a military staff officer do? Deduce the war situation, plan actions, and achieve victory by surprise? A genius who combines three professions and is even proficient in psychology, deception, and assassin's disguise is actually a timid, wretched fat man. When this strange guy is forced to be involved in a war, what will he do?