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Because Matsuo had slain a god-like entity such as Harumi, he gained the Title of Slayer of Gods on his System Status, the same one Frank had gained back then when he had yet to become a god but had beaten the shit out of some.
Matsuo also ended learning the amazing "Divine Enemy" Skill, which enhanced his damage dealt against God-like entities! Thanks to Frank's System, Matsuo was growing pretty strong even as a mortal without an actual divinity, and even more, his Class as a Paladin of Frank's divine protection was only making him even stronger now.
Clementine admitted that Matsuo was also strong and that it surprised her. She could had never guessed the little mortal she picked up to fight her daughter who had just awakened her godly power she had sealed on her for her own good would actually beat Harumi at the end! It was a very unlikely scenario that ended turning to be true…
Check "The Protagnist's Sister Is Actually the Strongest"!