Mini Yon Soldier Rin!

Mini Yon Soldier Rin is a 1989 OVA that revolves around the story of a young boy who must thwart the plans of an evil scientist threatening global destruction. The boy, Rin, is the central character in this mecha anime, where he uses his Mini Four Robot to fight against the villain's army. The story unfolds in a world where science and technology play a significant role.