I'm not sure specifically as there could be many novels with this title or concept. It might be about strong female characters (alpha females) and the idea of karma, perhaps how their actions, good or bad, come back to them in some way.
Yes, there are quite a few. Some focus on their unique relationship dynamics within the omegaverse setting. For example, there are stories that explore how Karma, as an alpha, protects Nagisa, the omega. They often involve elements of trust and growth between the two characters.
You can try Archive of Our Own (AO3). It has a large collection of fanfiction, and there are likely many works related to this pairing. Just use the search function and type in 'alpha karma x omega nagisa' to find relevant stories.
We can conclude that Karma 5-3 represents intermediate level. In Chinese chess, Karmic 5-3 meant that he had already mastered one or two types of layout and killer moves, and was quite skilled in using them. A player of this level could lead the game into a familiar situation and basically defeat their opponent. Although the search results mentioned some other information, there was no specific meaning or further explanation. Therefore, based on the information provided, we can conclude that Karma 5-3 represents intermediate level.
Strange Tales from a Chinese Studio is an ancient Chinese novel. It tells many fantastic stories, including many plots about karma. In these stories, people could often see the scene of good and evil being rewarded, and the retribution of good and evil was sometimes beyond people's imagination. For example, in the Legend of the White Snake, the White Lady sacrificed everything to save her husband Xu Xian, but in the end, she was punished by the heavens and lost her beauty and life. The power of karma made people feel deep fear and vigilance in the story.
One possible fanfiction could be about female Karma's journey in the Assassination Classroom. Maybe she uses her intelligence and unique skills to outwit the other students in various assassination attempts. For example, she could come up with creative plans to get close to Koro - sensei while still maintaining her cool and mysterious demeanor.
She could have a secret power that only she discovers over time. For instance, the power to read Koro - sensei's thoughts briefly when she makes direct eye contact with him. This would give her an edge in the assassination attempts. She could then use this power to set up elaborate traps based on what she learns from his thoughts.
Alpha females are usually highly ambitious. They strive for success in their careers or personal goals. They might set high targets for themselves, like aiming to become the top executive in a company within a few years.
The cause and effect of mouth sores was not yet fully understood. Mouth sores were usually caused by infection after injury to the oral mucus membrane, such as bites, food irritation, lack of vitamins, and so on. The cause of oral ulcers may be related to genetics, environment, immunity, and other factors. Some people may be more prone to developing mouth sores, and the occurrence of mouth sores may also be related to an individual's immune system, genetic background, environmental stress, and other factors. However, there was no clear evidence that mouth sores were related to a lack of vitamins. There was currently no specific medicine for the treatment of oral ulcers. Under normal circumstances, oral ulcers would heal themselves in about a week. If the mouth sore has repeated attacks or does not heal for a long time, you may need to go to the stomatology department to check the cause and treat it. In general, the causality of oral ulcers still needed further research and exploration.