Hanafuda Yuukyou Den is, as you guessed, a Hanafuda playing card game for the Famicom. It is based on the Koi-Koi style of play. Basically, you play with picture cards, and the objective is to make pairs and combinations known as "yaku", which is how you ultimately score points. As with many such games in the era, this one involves scantily clad women, who you get to see more of as you win more and more. Nonetheless, the Hanafuda card game is fun and a bit different than the usual cards you know, so I would recommend trying it out!
ESRB Rating: Not Rated