Hirotta Dorei-tachi ga Tabidatte Haya Juunen, Nazeka Ore ga Densetsu ni Natteita @comic

The five girls he once took in, raised, and sent off. To fulfill the promise of reuniting with them, Alise, an Around Forty Adventurer, left the deepest part of the remote "Demon Forest" for the first time in 10 years. However, the state of the world seems strange. Those girls are the Heroes who defeated the Demon King, and "Alise" is a legendary Great Hero... there's no way that's me, right? Standing in front of a bewildered Alise is Gagaitas, a Knight of the Round Table of the Demon King's Army. "For Whom Does That Sword Swing"——With the bond with his Hero girls in his heart, the middle-aged man grips his sword once again.