How is Akame Ga Kill Zero different from the main storyline?

Akame Ga Kill is certainly one of the starter anime everyone gets recommended to. But what about Akame Ga Kill Zero? Is it any different from its famous counterpart?

Akame Ga Kill! Zero Vol. 1 - Manga Review — Taykobon

Chapter 55, Akame Ga Kill! Wiki

Used copy of Akame Ga KILL! ZERO, Vol. 1 by Takahiro; Kei Toru for sale on Pangobooks.

Akame Ga KILL! ZERO, Vol. 1 by Takahiro; Kei Toru, Paperback | Pangobooks

Akame ga KILL!, Vol. 15 (Paperback)

Manga Review – Akame ga KILL! Zero

What do you think is better, Akame Ga Kill! Manga or anime? - Quora

Chapter 7 (Zero), Akame Ga Kill! Wiki

Is Akame ga Kill! Zero getting its own anime? If so, will it be better than Akame ga Kill? - Quora

Manga Review – Akame ga KILL! Zero

Akame ga KILL! ZERO, Vol. 3 on Apple Books

ZERO, Vol. Release Date: 2016-06-28. Publisher: Yen Press. Notes: vUnmarked. Text appears to be free of highlighting, underlining or writing. Binding

Akame ga KILL! ZERO, Vol. 2 (Akame ga KILL! ZERO, 2)

Akame ga Kill! Zero, Akame Ga Kill! Wiki

Chapter 4 (Zero), Akame Ga Kill! Wiki

Is Akame ga Kill! Zero getting its own anime? If so, will it be better than Akame ga Kill? - Quora

Akame Ga Vengeance Zero! (Akame Ga Kill Zero x OC) - Chapter 3: First Blood - Wattpad