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When Aruliel woke up she found herself being greeted by Chaos, Abyss, Erebus, and Rot.
Erebus and Rot were technically like the two adoptive children of Chaos and Abyss at this point, the two were clingy and acted very spoiled with the two, and the two also enjoyed spoiling them.
When Rot woke up healed, she was hugged by Chaos because he felt very guilty because of what had happened to her, even if tearing herself in half was not that bad as an undead, it was still something impactful that hurt her, and Chaos had to at least hug her and apologize.
Since yesterday when that happened that Rot had been extra clingy, and she immediately showed up at the side of Chaos and Abyss, but the two couldn't really move her away now that she was happy, so they let her hang around.
Check "The Protagnist's Sister Is Actually the Strongest"!