That Time I Got Reincarnated as a Slime (2018)

S03E17 The Lightspeed Hero

Upon discovering the existence of an elf slave trade, Rimuru tasked Soei with looking into it. However, Soei found that the slave traders had already been dealt with by Masayuki, the Lightspeed Hero. Rumors are now circulating that this Hero is on his way to Tempest with the intent to eliminate a Demon Lord...