Phantom Alchemia: Silvia no Dokidoki Sakusei Toshi Keikaku 1

Sylvia is a completely ordinary girl who lives alone in the depths of the mountains. Accompanied by a man named Steve, who comes to visit her, she reaches the border town of Eranberk. And, without even understanding what is happening, Sylvia finds herself thrown to the ground and raped by Steve.
- “Why...? I should hate him, but...”
Without even time to become depressed over such a traumatic first experience, Sylvia feels strength surging from the depths of her body. Without knowing it, she had a hidden talent for alchemy. Having awakened her alchemical power with the help of sperm, Sylvia is tasked with using this power to develop the city. Thus, for the sake of alchemy and urban progress, Sylvia begins collecting sperm. After shedding her blood for the first time, an aspiring alchemist with huge tits, Sylvia, is born.
What? Is the sperm absorbed into her the source of alchemical power? For this border town to prosper... how many men will she have to... ugh...?