As of the latest chapters I've read, Megumi is still alive in the manga. Usually, such major character deaths are significant plot points and would be well-publicized if they occurred.
Well, Megumi's story in the manga was full of twists and turns. She had to overcome various obstacles, and there were also some unexpected developments in her relationships with other characters.
Nope, Megumi is alive. The author has chosen to keep Megumi's character alive to continue developing their story and interactions within the manga's world.
" Life and Death Arena " was about the experiences and growth of a young doctor in the life and death arena. He took over a dying patient but was forced to work in the shadow of death. During his treatment, he encountered many life-and-death challenges and the complexity of human nature. Through this doctor's experience, the readers could see the fragility and preciousness of life, as well as the good and evil and contradictions in human nature.