Slayers Special is a novel series written by Hajime Kanzaka and illustrated by Rui Araizumi. 
Each volume consists of one-shot stories (sometimes, 2-chapters stories) about a pre-Slayers Lina Inverse and Naga the Serpent. 
(Source: Kanzaka Wiki).

Join Lina and Naga as they thwart a plan to create the ultimate chimera. Watch as they attempt to turn the effeminate son of a noble family into a man deserving appointment to the Royal Guard. And double the trouble when our heroines take on a rogue magic user with a mirror that duplicates his enemies in reverse! 
 
(Source: ADV Films)

When Naga torches a tavern to get Lina's attention, the local townspeople demand that they make restitution by rescuing villagers lost in a labyrinth! 
 
Then, after seeing no profit in protecting the pampered Sirene Fitzmeier, Lina arranges a kidnapping to teach her a lesson. Unfortunately, she hands Sirene over to the wrong kidnappers! 
 
And, formal fashion designer Tatjana Dayward and unisex clothing maker Marty Lenford discover Naga and set out to make her the next fashion craze! 
 
(Source: ADV Films)

Lina Inverse, the precocious and dangerous sorceress, has teamed up with the barbaric and busty Naga the White Serpent. Together they fight demons, thieves and monsters...all in the name of treasure and a good meal. Join Lina and Naga in their latest tale of tribulations and triumph in a medieval world of monsters, mayhem and monkey business. 
Adapted from the Slayers Special light novels.

As a continuation of the Slayers Special novel series, each volume also consists of several one-shot stories (sometimes, 2-chapters stories) about a pre-Slayers Lina Inverse and Naga the Serpent. 
 
(Source: KanzakaDex)

Beautiful and brilliant sorcerer girls just can't have nice things, huh? All I wanted to do was swipe a little bit of bandit treasure. Now suddenly I'm being chased around by icky trolls, nasty demons, mean mummies, and brooding golem bad boys. And for what? A tiny little artifact that can bring about the end of the world? Hah! I'll show them there's a reason you don't cross Lina Inverse... 
 
(Source: J-Novel Club)

Having lost the Sword of Light in the previous battle, Lina and Gourry continue their journey in search of a replacement weapon. On the way, the two of them meet up with Amelia and Zelgadis in the kingdom of Luvinagard while taunting some pirates. Lina is happy to reunite with her old friends, but appearing before her is Luvinagard's Inspector of the Special Investigative Unit; a man called Wizer. However, Lina is amazed at his unusual behavior... 
(Source: Anime News Network)

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