I seem to recall from way back someone saying that in the raws Shizuko's name was the only one spelled with kanji even though they're all Japanese names. This would probably indicate that she's a descendant of an "transferee" from Japan while the others are not.
- Moms have Japanese-sounding name
- the Japan-like place & its culture are completely foreign to them
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Ah the joys of market competitionWait ages for a chapter then 2 uploaders upload it at once