Hopefully someone will step in to tell us what we're looking at here!
Kylina has created a deck of Death Note playing cards. It appears to involve some kind of strategy with monsters, traps and ways to continue on to win. That's really all I could adequately discern.
Sorry Kylina! (Though if you want to come and introduce your Death Note game yourself, you are more than welcome.)
The card game she has made is actually just a deck in a pre-existing card game: "Yu-Gi-Oh". Yu-Gi-Oh is a popular card game that was made by Konami and is played across the world. What she has done is made a deck using cards that already exist; using a Death Note theme. Sorry! Just trying to clarify. :)