Thank you for translating this prequel for us guys really.
Arsenio and Sauro really got unlucky with everything that happened, having to make a series of crappy choices quickly, and so several things obviously coming together to fuck them up later, it's so sad. I'm actually kinda glad I read Majo no Geboku first, to know in advance that things will get better for them someday helps haha.
Also I really like Rico and Sara, he seems really smart and kept helping Arsenio since he got he's a good kid, and poor salamander seems just grateful that this human with a warm heart accidentally freed it but doesn't understand that it might cause it some serious troubles. I'm guessing we'll see Caith Sith and the viscount's daughter some day again, and I hope Arsenio will maybe talk/bond in a better way with Sara, like maybe that's what he needs to control his fire better in the main story.
Anyway this prequel is really good, good complex backstory for very lovable and interesting characters and their relationship, I'm so happy I gave a try to the adventures of the witch's servant.