Tatsuko has been bored out of her mind lately. There's only so much to do when you're stuck in prison. She has decided that if she does not find something fun to do within the next hour that she will start breaking things or attacking people, not unlike an understimulated dog. Or dragon, in this case.
Luckily for the prison as a whole, Tatsuko comes across the dartboard in Hikaru's cell before this hour has elapsed. Looks like she will postpone her destructive rampage until another time.

"Ooh, sharp, pointy things!" Much to her disappointment, there's been a real lack of them in this prison. Probably for a good reason, but that's not something Tatsuko cares to think about. Regardless of whether Hikaru actually invited her to join, she takes a dart, inserting herself into the game.

"So, do I just throw it, or…"