Tensei shitemo Shachiku Datta Ken That Time I Got Reincarnated (Again!) as a Workaholic Slime

Synopsis

When I woke up, I was a slime, and still a salaryman?! Moreover, Benimaru, Shuna, and everyone else is here, and I'm the section chief?! Rimuru's middle manager life begins without knowing the cause of it all! (Source: Kodansha, translated)