Corporate salaryman Satoru Mikami is a completely average 37 year old living a monotonous life in Tokyo, save for never having gotten himself a girlfriend. In the middle of a completely casual meeting with his colleague and his partner, Satoru falls victim to a random stabbing and in a twist of fate is reborn as a slime in an alternate world. Upon making friends with the dragon Verudora and with a new name – Rimuru Tempest, he starts his gooey journey to create a world that is welcoming to all.