Ryoma, the boy from another world, has gotten a chance to visit the Jamil family again. He and his merchant acquaintances, Serge and Pioro, visit the Jamil estate and hear that an unexpected person is getting married. Ryoma agrees to help prepare for the wedding, but at the same time, he inexplicably starts working on a new product using slimes. There are more familiar faces and peaceful moments, of course, and new allies too!