We consider a star-shaped region consisting of half-lines imposed by the Kirchhoff boundary conditions at the junctions, and then consider the various motions of the pulse-like localized solutions that appear in the reaction-diffusion models. In this talk, I will show that the interaction between a pulse and a junction is determined by the interaction between pulses. As a result, repulsive interactions of pulses induce the attracted motion to the junction. We also discuss the motion of multiple pulses on a metric star-shaped graph.