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My mother had begun to recall those times once more, it seems that she's always quite nostalgic about them, despite not having been so long since then compared to her long life. Perhaps in those times she discovered many things and changed a lot as a person, which created an impactful memory of such times… But aside from happiness there is also some melancholy with her, she said "I miss them", but isn't she with three of them? Also I know that the Witch of the Blue Mountain is a fourth, so how many heroes were there?
…I don't want to make mother remember those times, to be honest, so I just decided to go with the flow and not ask any more questions that were not regarding the classes she was giving to us. Aquarina and Zack also quickly realized that it was better to leave her be for now, as we concentrated into her classes, relieving her as well.
Check "The Protagnist's Sister Is Actually the Strongest"!