An unremarkable detective and mystery aficionado has died.

However, retaining his memories, he is reincarnated as the commoner Van into a classic fantasy world of swords and magic, monsters and dungeons. Van, with his exceptional magical talent and knowledge and sensibilities from his previous world, rises through the ranks despite being a commoner. However, a mysterious murder occurs before Van. Can Van leverage his knowledge of mysteries to solve the case?

A fantasy mystery.

*This novel is a derivative work of Mr. Katazato's "The Necessity of a Great Detective in Fantasy" and is serialized with permission from the original author.

*Case 1: The Judgment Observed by the Great Tree. An incident occurs in the nature park where Van is vacationing. Under the great tree, for what purpose was the judgment handed down?