18+ 10-nenburi ni Saikai shita Kusogaki wa Seijun Bishoujo JK ni Seichou shiteita

Arizuki, who quit his job in Tokyo, decided to look for a job in his hometown of Shizuoka. He bumped into a high-school girl when he was about to re-start his life. That very girl, was the girl who lived with him next door. That very girl with whom he used to play a lot, but Arizuki was yet to notice that at all. All because of her transformation...

(Source: Kakuyomu, translated)