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After Gaia spoke to me about the many plans and information she knew about, she ended telling me about her plan on dealing with the giant tentacle, which was to not fight it at all but close the rift!
"But wouldn't that slice the tentacle?" I asked.
"Yeah!"
"…"
"…"
"Don't you realize the entity's power? I bet if we let the tentacle here, it might still retain some intelligence or life or something, if it goes in a rampage, it might destroy the world, wouldn't it?" I asked.
"Eh?! You're right… That's certainly a possibility I… didn't thought about, haha…" sighed Gaia.
"Wait, are you laughing?! This is a serious issue, planet's core!" I sighed.
Check "The Protagnist's Sister Is Actually the Strongest"!