Manner of Death manga volume 1 features story by Sammon and art by Yukari Umemoto.

When the skilled coroner Dr. Bunnakit is called to examine the body of his childhood friend after her “suicide,” he soon determines that she was actually murdered. That night, a mysterious stranger threatens him, telling him to rule her death a suicide—and after he confides in his prosecutor friend about this incident, his friend suddenly goes missing. But all hope is not lost, as a young lecturer named Tan offers to help him get to the bottom of all this—which would be more reassuring if Tan weren’t the prime suspect...