The Strongest Battle Harem is Born 4

Hiro who was on his knees held his breath and waited. Asking his wives to go with him to the battlefield meant exposing them to danger. But to him, leaving them at home was equally dangerous.

And being weak by the time the invasion comes is just stupid. Survival only comes to those desperate enough to take it. Hiro didn't want his wives to waste away waiting for him.

They had both courage and intelligence. His woman being as weak as they were risked injury and pain to fight a man who would otherwise kill him. Thus Hiro believed just like how he raised the San-Baka and Tsugumi.

Vanessa, Jade, and Raylene could become powerhouses. But this would be incredibly selfish of him. If they did not wish for a life of battle forcing them into one just so he feels better could not be considered love. It would be considered an obsession.