Kage no Jitsuryokusha ni Naritakute ชีวิตไม่ต้องเด่น ขอแค่เป็นเทพในเงา

Just like how everyone adored heroes in their childhood, a certain young man adored those powers hidden in shadows. Ninjas, rogues, shadowy mentor types, that sort of deal. After hiding his strength and living the mediocre life of a NPC by day while undergoing frenzied training by night, he finally reincarnates into a different world and gains ultimate power. The young man who is only pretending to be a power in the shadows... his subordinates who took him more seriously than he expected... and a giant organization in the shadows that gets accidentally trampled... ...