Apocalypse: From the Start, I Won Over the Neighboring JK Girl in Black Stockings

[Decisive and ruthless + the saintly types need not apply + overwhelming firepower + plenty of beautiful women + upgradeable pocket dimension] Ye Tianyu is reborn before the apocalypse and receives a boost from the Mobile Fortress System. Can taking beautiful women into his fold make him stronger? AKs? Gatling guns? Self-propelled artillery? All mercy will be erased. He hunts down, one by one, everyone who betrayed him in his previous life.