I Become the Strongest Adventurer in Isekai with Cumming System

WARNING: FULL OF ADULT CONTENT - PLEASE BE WISE READERS --- Wait a bit, where am I now? Zane didn't mean to get hit by a truck while he was leaving campus, and when he opened his eyes, he was in a different world. "Am I in an isekai world now?" But before Zane could find out, a monster suddenly attacked him. It was a powerful Female Mucus Toad that could spit poison from its mouth. [Ding!] [Defeat the Mucus Toad - Level S using cumming and level up!] [Punishment if failed: Death] Zane zoned out for a bit before smiling wide. It was indeed his long dream since childhood, to get isekaid and collect harems. "Hell, yeah! Let's do this!"