blade of justice ( male swordsman x off brand,anime and crossover harem)

in the world we're humans lived at day and monsters at night, lust was everywhere and Ready to Let it out, but what if someone Actually prevent the girls to be rape from anyone? a boy name Y/n who Is the son of a legendary swordsman who cut down anyone by the legendary blade Yamato, a transfer student now Is among of all girls as the only boy enter the Academy, at first they we're afraid of him but as it turns out, he hates perverts and even beat the Shit out of them until they stop being perverted and never came back, now that world knows (aka girls) heard this swordsman, the girls decided the only guy who prefer Let them take there virginity Is The handsome swordsman