Xenologue 

Also called a gaiden, this is a side story that has no consequence on the larger plot of a story. Xenologues are neither a prequel or a sequel. The content of a xenologue is generally consistent with the main story, but will not always be. Sometimes xenologues are entirely alternate stories, sometimes they are brief additions. They are often canon, but not always.

Have you seen the new xenologue? It adds a beach day in-between episode six and seven!

Xenologue by ChunkySL June 5, 2021

xenology 

the study of foreign things-language, culture, life style, demography and all.

Xenology is not my cup of tea; however, it is better have some insight into it.

xenology by Uttam Maharjan 2 November 5, 2014

Menologue 

A platform for dialogue about issues that affect men.

We are going to have an extensive menologue on financial stability.

Menologue by Menologer January 16, 2022