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Boxxy's memories began to emerge within her mind as she rested.
After the battle against those four powerful Gods, she had been heavily wounded, even after doing everything she possibly could…
She remembered having seen Yuki so wounded, it was horrendous to remember it again.
Boxxy's memories were not so long, she had a short life until now, perhaps a year or so, but even then, her mind had developed greatly since then.
Since she was "born" that she knew of a Master, Chaos.
She was a summoned monster, but most summoned monsters are often created on the spot through the materialization of energy through the summoning artifact.
She remembered that she was given a purpose the moment she was "born", and that was to serve her lord, her master, with everything she had.
Check "The Protagnist's Sister Is Actually the Strongest"!