Both stories focus on eliminating an enemy that is difficult to defeat. In Shinigami x Doctor, not anyone can destroy these poisonous flowers or else they would get infected and die. Only doctors can kill the flowers, but of course doctors are not people who can appear 24/7 in every situation, so they do their best to rescue people. Meanwhile in Donten ni Warau, people need both the ability (physical or magical) and knowledge to kill the Orochi, which means not everyone is capable of killing it. Both manga are very emotional, and include sibling bonds that are touching. The death of one's parent(s) is present in both stories, which made me literally cry; the scenes were drawn so tragically and beautifully, and I felt the sorrow the characters had. The characters from both stories have every right to be sad, therefore it would be justified if they lived depressed lives. However, the characters from both stories try to smile despite how difficult their circumstances are, and have courage and hope for tomorrow. These stories are uplifting through the strength presented in the characters. Karakara Kemuri did a great job at depicting the emotions and struggles of her characters in these two manga. read more
Tegami Bachi and Shinigami x Doctor have organizations that fight against a monster who kills humanity ,and when that monster is defeated they both live behind the memories of their victim in Tegami bachi it's in form of heart and in Shinigami x Doctor is in form of pollen.