A common theme is rivalry. Since they are often pitted against each other in the original context, fanfics play on this dynamic, showing how their competition can also be a form of connection.
In the manga, Yumeko and Ryota don't end up together. The story focuses more on the gambling scenarios and character developments rather than a romantic ending for them.
I don't consider Raw Story to be a fully legitimate news outlet. There have been instances where their stories have been factually incorrect or presented in a misleading way.
To pitch a story successfully to a news outlet, you need to do your research on the outlet's style and audience. Craft a catchy headline and a short, engaging summary. Also, include relevant sources and evidence to support your story.
I've heard of 'The Yumeko - Mary Encounter'. It begins with a chance encounter between them and then explores how their personalities clash and yet also complement each other, leading to a unique and engaging story.
There was a story about two people at an outlet. A lady lost her wallet while shopping. A kind man found it and returned it to her. She was so grateful and they got to talking. They found that they both loved the unique finds at the outlet. As they continued to meet there for shopping, their connection grew deeper and deeper until they fell in love.
The ideal time can vary. Generally, pitching during the weekdays, preferably in the morning, gives you a better chance. But it also depends on the news outlet's schedule and the nature of your story.