Seishun 2-shuume no Ore ga Yarinaosu, Botchina Kanojo Tono Youkyana Natsu

When I woke up, I had returned to my junior high school self—. I had become a worthless adult who had given up on my dreams. Even though I was popular with women, I was working a dead-end job with no money. I blamed everything wrong with my life on my time in junior high school, and in particular, on her — Akimiya Hazumi, my first love. As I was thinking about this, I got into an accident and found myself time-leaping back to junior high. Back then, I was a nondescript mob character, but now I can properly groom myself and unleash my adult social skills. Before I knew it, I was successfully living my ideal youth! Using my memories from the past, I saved the beautiful gal, Chigasaki, on my way to school, and helped to resolve the troubles among the popular boys and girls in my class. All that was left was to find out what really happened from “that summer” when the sunflowers were in full bloom — an incident involving Akimiya Hazumi, the root cause of the downfall in my life—. (Source: Dengeki Bunko translated)