GOLOSSEUM, by Yasushi Baba. First published in 2015 and first published in North America in 2018.
PLOT:
At the beginning of the 20th century, 3 strange records fell to earth. To most they sounded like just noise, but for a select few they held the secrets to incredible power. Decades later, the technology the records contained are used to create special bracelets that can enhance a person's strength and repel virtually every weapon save for physical attacks from other enhanced fighters. The leaders of the world hope to use their own arsenal of super-soldiers to gain power, but all of them are on the hunt for the most powerful soldier of them all: Sasha, a Russian woman known as the White Witch.
