While I understand the allure of secondary legends, I think such an addition has to make sense with the overall theme of a set. In this case, a random addition of Hiragana alphabet is, well, random and doesn't make sense. Why not Cyrillic, or symbol, or anything else? It's a "Chocolate"-themed set, so there's no need for other legends, other than maybe on novelty caps. I could actually see this set having an optional kit with no legends at all, to look like a literal box of chocolates.