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Miriam smiled back at her little siblings since she has memory of existing that she has always been trying to buy and sneak food inside. Sometimes it worked, other times the nuns stole it from her and because they were adults and strong against her, she was left hopeless, like that time they stole her cheese and bread she had bought.
But now it was different, thanks to Frank's bag, she could hide all the things she wanted, and they never thought a small piece of cloth attached to her belly would have anything. They had even found it before and inspected it, but they never found anything inside because the bag only opened its internal dimension to its owner or anyone the owner allowed, a special feature that Frank added to it.
And now with Ryujin, the nuns won't try to take away anything from her anyways, no more!
Check "The Protagnist's Sister Is Actually the Strongest"!