耶馬渓(やばけい)の暗い(くらい)洞窟の(どうくつの)中(なか)で了海を(りょうかいを)発見(はっけん)し、刀を(かたなを)抜いて(ぬいて)斬りかかった

Meanwhile, Minosuke, the son of the master killed by Ryokai, had grown up and spent many years searching for Ryokai to avenge his father's death. Finally, Minosuke discovered Ryokai diligently digging the rock inside the dark cave at Yabakei, drew his sword, and lunged, shouting 'You are my father's enemy!'