Hou no Bannin wa Mamoru Sekai wo Erabenai

Yuuki Nakamura, an elite prosecutor, attempts to prosecute the president of an IT company who caused a heinous traffic accident, but instead is killed by dark forces. When he comes to, he finds a goddess in front of him who asks him to bring order to another world with the power of law. He accepts the proposal, is given the skills to be a lawgiver, and is reborn into that world. His first job is to defend a legendary dragon who stands accused of "murder" for burning a party of heroes to death with his fiery breath..!

(Source: Kodansha, translated)