Elsa and Meili, Assassin Sisters' Dark Diary

{{Re:Zero Light Novel Volumes Elsa and Meili, Assassin Sisters Journal (エルザとメィリィ、裏稼業姉妹暗躍日報) is a shop exclusive limited edition short story.
 * Name = Elsa and Meili, Assassin Sisters Journal
 * Image = Assassin Sisters Diary 1.jpg
 * Image-Size = 275px
 * Kanji = エルザとメィリィ、裏稼業姉妹暗躍日報
 * Romaji = Eruza to Meiri, ura kagyō shimai anyaku nippō}
 * Next= Elsa and Meili, Assassin Sisters Journal KILL 2}}

Characters

 * Elsa Granhiert
 * Meili Portroute
 * Emilia (mentioned)
 * Reinhard van Astrea (mentioned)
 * Cecils Segmund (mentioned)
 * Mama (mentioned)

Summary
When Meili was in her early teens, Elsa received a job to secure the insignia of a young woman named Emilia in the capital city of the Kingdom of Lugunica. Meili accompanied her to the capital, and the pair booked a room in an inn where they kept their belongings. However, the job went awry and Granhiert was forced to flee to a safehouse without her prize. As soldiers scoured the capital looking for the Bowel Hunter, Meili entered the dingy safehouse and found Elsa asleep on a pile of hay with wounds coating her body.

Portroute complained to her older partner about her tendency to end up in dangerous situations fill of filthy environments. The younger assassin, as she tended to the newly-awakened Elsa's wounds, expressed dissatisfaction that they likely wouldn't be able to use their safehouse again due to the stench of blood Granhiert had dragged in. Meili was perplexed by Elsa's wounds, as the Bowel Hunter's power was supposed to accelerate the speed of her recovery. Elsa explained that it was likely due to the opponent she faced—the Master Swordsman, Reinhard van Astrea.

Reinhard was the greatest warrior of Lugunica who was widely considered to be the most powerful entity in the world. Nevertheless, Meili was surprised he had defeated Elsa, whom she presumed could only be beaten by Mother. Granhiert reminded Meili that it wasn't her first loss, as she'd also been defeated by Cecils Segmund several years ago. Having finished her treatment, Meili and Elsa decided to leave the capital. After procuring a change of clothes for Granhiert, Meili used the powers of a Demon Beasts to temporarily change their hair colors.

They soon came across a guard who failed to recognise them and helpfully escorted them back to the main road. Although they initially planned to lay low, the pair discovered a new set of orders awaiting them among their baggage back at the inn. The letter, addressed solely to Meili much to Elsa's disappointment, instructed Portroute to stoke mayhem in the area surrounding the mansion of Margrave Roswaal L. Mathers. Although Granhiert was upset, she decided she would make a doll of Reinhard for Portroute to pass the time.