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"I just don't like it! I don't want to eat you!" Umbra said. "It feels weird, why would I? Let's do this differently! Let's find… another way!"
"You're… so stubborn." I sighed, giving her a slight smile. "You remind me of myself. I guess we are really two faces of the same coin, haha… Then what do you suggest?"
"Hmmm… Let's blow up this space!" She said with a smile.
"E-Eh? But this is something like the subconscious, isn't it?" I wondered. "This space…"
"Nuh-huh!" She said. "This place is called… Umbra World. It is my world. I made it when I went to sleep… Since then, I've been here. I can't leave, and I am trapped in the world of my own creation… But maybe we can get out together."
"Your world?" I asked. "Then this space… God, so you really are as strong as a Primordial if you could just make up a world so easily, dear."
"I've lost most of that power…" She sighed. "But the Umbra World will stay… somehow."
Check "The Protagonist's Sister Is Actually the Strongest"!