Invitation from Matenro - S1.E30

Hadogumi continues training to capture Matenro. However, in the middle of the training, the real Matenro appears. Everyone chased after Matenro, but Hiroshi took action on his own from the middle. Matenro then praises Hiroshi's courage and treats him to a sumptuous meal. Furthermore, Matenro continued to give Hiroshi what he wanted one after another. What is Matenro's aim?