What are the key elements that make a Japanese romance comic popular?

Popular Japanese romance comics often feature well-developed characters, emotional depth, realistic portrayals of relationships (even in fantastical settings), and compelling storylines. Themes of self-discovery, personal growth, overcoming obstacles, and the importance of connection are frequently explored. Visual storytelling, with expressive character designs and detailed artwork, is also crucial. Furthermore, the emotional resonance and the ability to evoke feelings of empathy and hope contribute significantly to their popularity.