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Please clarify: Are you looking for a specific work and this is what you remember about it? Or are you asking for any work that fits this description?
I need material to write fanfic, so any show with that plot is fine.
I... don't know that there's a ton of non-porn stories where a main character gets impregnated by a main villain. You could check out the trope pages for Child by Rape, mmmaybe What If The Baby Is Like Me, and Raise Him Right This Time, or just check out stuff on the Pregnancy Tropes page in general to get ideas?
Fullmetal Alchemist (the manga, and the Brotherhood anime) has an example of Raise Him Right This Time at the very end, and Orphan Black S2 has a character inseminated (literally, with medical equipment) by a villain, but while the character does want to raise the child, she doesn't even spare a moment of thought about the father or his DNA's impact on the child. But if you're just wanting to write fanfic anyway, you could just check out the Rape As Drama page and pretend a conception happened where one actually didn't in canon. (Or just write an AU in general for a series that didn't have even that much to set it up? Or just write an original short story about the concept! Not sure why you need a canon set-up for this.)
@livewithstyle : thank you, but i already check and there are no example that i need (What If The Baby Is Like Me is half the bad guy is the alive parent and other half about the parent not bad, just non-human. Raise Him Right This Time is mainly about age regression, not a new baby...). My intent is write a fanfic about a yin-yang child raised by a mother both love and hate him (like Harry Potter with a less-abusive Pentunia as his birth mother. She does want to raise the child, but also does thought about the father or his DNA's impact on the child)
I want to find manga/anime/comic/film... with plot like this: AFTER the heroine KILL the Big Bad, she found out she is pregnant with his child and decide to raise him/her to a better person than his/her father. More describe emotion, better example.