The Otherworld, but with a Cultivation System

Higashiyama Naoki died young in his previous life due to illness, then was born into a world much like Japan. It's a world full of beautiful JK girls, but also one fraught with danger, populated by sleazy older men, perverted nerds, brats, old men, and Black people. He figured that with his memories of some of the plot in advance, he could stay home and enjoy a comfortable life without worrying about food or clothes. But from the start, his home was consumed by fire, leaving only him and a little maid from the entire Higashiyama family.

Fortunately, Higashiyama Naoki has a cheat of his own, though the System insists that the world he's in is a cultivation world and tells him to save the heroines whose intelligence has been eroded by Heaven's will.

The runaway beauty, the plain-looking girl with glasses, the girl from the library, the underclassman from the swimming club, the upperclassman from the tennis club, the three delinquent girls, the gloomy livestreamer, the bookstore big sister, the convenience store sisters...