After a life marred by misfortune, Ryouma Takebayashi dies peacefully at 39 only to be offered a chance at rebirth by three compassionate deities. Reincarnated into a magical realm, his sole mission is to embrace himself and savor life to the fullest. Endowed with extraordinary physical prowess and the ability to master all elements, Ryouma embarks on his new journey as a child in a lush forest. Focusing on studying slimes for three years, he cultivates unique variations and builds an army of these creatures while honing his magical skills. Despite contentment in his solitary cave abode, he craves human companionship. Upon aiding an injured member of a noble group, Ryouma decides to join them, venturing out of the forest alongside his slime companions. As he steps into a fresh world, his prowess in magic and slime manipulation earns him both awe and respect, setting the stage for new adventures.