This specific entry appears to be an drama. In these works, a voice actor performs a role directly to the "listener," who acts as the second character in the scene. The "ENG" in the keyword suggests that this version includes an English translation, either as a transcript or embedded subtitles, for non-Japanese speakers to follow the narrative. The Concept: "Vertin in Detention"

: Many actors (Seiyuu) list their works on sites like VNDB or official talent pages to help fans track their latest releases. Trait: Voice Actor | vndb

The title "Vertin in Detention" points toward the thematic content of the audio:

: Some releases include "behind-the-scenes" recordings or alternative endings. How to Find and Support the Creators