'Ouran High School Host Club' is a great option. Haruhi Fujioka, a scholarship student at an elite school, accidentally breaks an expensive vase in the Host Club room. To pay off the debt, she has to work as a host. There are various romantic subplots, especially the relationship between Haruhi and Tamaki Suoh, which is filled with comical misunderstandings and heart - fluttering moments.
You should try 'Ouran High School Host Club'. It's not just romantic but also full of comedy and charming characters. The plot is both fun and heartwarming.
'Nana' is a great choice too. It has two main characters, both named Nana. There are multiple love stories in this manga. Nana Komatsu is a naive girl in love with Ren Honjo, who is in a rock band. Meanwhile, Nana Osaki has her own complex relationship with Nobu. The manga delves deep into the characters' lives, loves, and dreams, and the art has a unique style that suits the story well. The love stories are realistic and full of the ups and downs that come with relationships.
Some of the most read romantic novels include 'Pride and Prejudice' by Jane Austen. It's a classic that has charmed readers for generations with its story of Elizabeth Bennet and Mr. Darcy. Their relationship develops through misunderstandings and social differences, making it a very engaging read.
One option could be to check out your local library. Sometimes they have manga collections and might have Romantic Killer. Also, some online subscription services specifically for manga might have it. Just do a quick search to find the right one for you.
For me, 'Pride and Prejudice' is the most romantic novel. The relationship between Elizabeth and Mr. Darcy is full of tension and gradual understanding. Their exchanges, from initial misunderstandings to final mutual love, are really charming.
I would also recommend 'Raja Gidh' by Bano Qudsia. It has a complex love triangle that is explored in great detail. The novel is known for its deep exploration of human emotions, especially love and jealousy.