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Ruby seemed a bit bored of just staying in the shop.
"Well, we sell stuff here so we'll wait until a new customer comes… the shop has some sort of charisma enhancement, so it shouldn't be hard for customers to come at some point." Said Frank.
"Oh, I see… But I want to explore and fight big monster…" said Ruby.
"Well, you've always been a girl eager to explore and fight big monsters…" said Frank.
Recalling Ruby in the past, since she was born as a little fire salamander that she had always wanted to fight new enemies, and had accompanied Frank on his journey since then.
It could be said she was his first ever companion! However, as found more and more people at his side that could fight, Ruby ended being pushed back.
Check "The Protagnist's Sister Is Actually the Strongest"!