User blog comment:B214/High School DxD Hero Episodes review/@comment-3965848-20180516173756/@comment-71.221.38.212-20190108035749

Highly unlikely they went to the same school. Examine the names for openers: Jeanne (French origin), Heracles (Hellenic origin), Connla (Gaelic origin), etc. The odds are narrow that so many Sacred Gear Wielders (Especially High-Tier Longinus) could be found in a single school without some major strings being pulled. This more looks like a Deity or longtime travelers handiwork. It's likely a fashion choice to underlay, ''We are Humans. We will vanquish all nonhuman evils from this world.''