One day, the life of middle-aged Japanese businessman Ryoma Takebayashi comes to a sudden and disappointing end, but after his death, three great gods seek out his cooperation and reincarnate him as a child in another world filled with swords and magic.

Ryoma, the boy from another world, takes the opportunity to revisit the Jamil estate, where his fellow merchants Serge and Pioro and a friend's unexpected marriage are all converging. Ryoma's happy to help the young lovebirds--provided he can tear himself away from developing new uses for his slimes and expanding his business! There's more familiar faces and laid-back scenes to come as well, of course, and a stalwart (if dubiously attained...) new ally too!