So What's Wrong with Getting Reborn as a Goblin?, Volume 3 (So What's Wrong with Getting Reborn as a Goblin? #18-27)

Akira, a former salaryman reincarnated as a goblin in another world, has steadily been developing his quaint goblin village into a prosperous society. However, when three elven sisters - former subordinates of the slain Archfiend who entrusted Akira with his power of command - arrive on his doorstep, they come bearing a grave and ancient woe... Akira can fend off monster hunters, but can he defeat the affliction of the ageless? Take it from the mysteriously flawless Prince Albert South Windsor of the human empire: If you turn every failure into a lesson learned, you can overcome anything...!