Tensei Goblin dakedo Shitsumon Aru?

Akira Yagami spent his previous life paying the price for his own kindness, and it ends when he dies saving a child from an accident. When he opens his eyes again, he is neither a hero nor even human, but a goblin in another world, part of a species whose members normally live only seven days. The ability he is born with breaks that limit and gives him time he was never supposed to possess. Rather than accept the short fate waiting for him, Akira begins changing his place among the goblins and developing his strength, determined to build a life longer and greater than his species' rules allow.