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Harumi learned a big story behind Frank, which lasted a few hours of quick and resumed explanations, and learned about the whole journey he had in another world while everyone here was so worried about where he went.
However, through this entire journey, he grew very strong, found many allies, and forged a new resolve, managing to get past the trauma of the death of his parents and even learning the truth about his father and what was he really.
He even got buffer and handsomer, but that wasn't part of the thing.
As Harumi and Frank revealed each other to be big weebs, Harumi loosened a lot, and began to speak more casually with Frank. Apparently, she was an avid reader of Isekai Light Novels and Manga, so she identified a billion tropes through his otherworldly journey. It seemed that Frank had really experienced a big Isekai, a classic one with everything included.
Check "The Protagnist's Sister Is Actually the Strongest"!