"The scroll speaks of the legendary Hana Fuda, an ancient deck of cards. My mommy told me of these cards when I was young. Legend indicates that the cards are magic and may point the way to the remaining Oni Masks."
The Hana Fuda Cards are an ancient deck of cards forged to locate the Oni Masks and their respective ingredients to remove them from the faces of whoever wears them. They can only be used once per mask.
For centuries, the cards were kept in a holy shrine in the Japanese city of Matsue, but the shrine was later built over by an automotive factory, although the owner of the company decided to borrow their logo from the kanji for Hana Fuda. The Chans soon acquired the cards and used them to locate the remaining Oni Masks. When all the masks were found, Jade presumed they didn't need the cards anymore and put them in her bag. But when the Oni were released and they ended up imprisoned in Section 13, Jade carelessly threw the cards away, revealing the location of a tenth mask that is meant for Tarakudo.
It is not known how one can tell how the Hana Fuda Cards are grouped. Presumably, there are 30 cards, ten sets of three, each card indistinguishable from the other 29. A shortcut to the Hana Fuda Cards is to paint them after you've activated them.
- Hana Fuda means "Flower cards" in Japanese. Real-world hanafuda are traditional Japanese playing cards that bear little resemblance to the cards in the show, being less than half the size of a typical playing card and themed after Japanese flowers. They are typically used to play competitive matching games such as Koi-Koi, Go-Stop, and Hachi-Hachi.