hey, im looking for manga where the couple doesn't really know each other but develop their feelings after marriage. i prefer something light and just fluffy (if possible, realistic) romance between them. tho if you think it's good, something with heavy emotional drama is ok too. ecchi or mature scene is ok too, but i want shoujo/josei manga more. Nenene is a good example for what im looking for now. Please give me your recommendations! thank you!!

Definitely Taisho Wotome Otogibanashi if you're looking for some fluff romance and marriage. While the marriage was forced upon them by the main character's father, the female lead takes it in stride and mentions that while they are practically strangers, she will try her best to learn to love him, and hopes he will do the same.

Not a manga, but I recommend this one:

Hokuou Kizoku to Moukinzuma no Yukiguni Karigurashi (Novel)

I absolutely love stories with this plot haha. However there aren't that many that are good 😔

Here are 2 to try out:
Ou-sama ni Sasagu Kusuriyubi (typical josei with smut romance)
Why Are You Doing This, Duke? (hilarious AND super sweet! Not realistic like you asked but one of my current favorites!)

Futari Ecchi ? Lol

Pellua Iyagi
Marry Me!
Arranged Marriage with My Beloved Wife
Sasen mo Warukunai

Also No Doubt in Us but this one is more about estranged imperial couple relearning things about each other and rekindling their love.

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DONDAKEE!!