I didn't see anyone talking about this so I thought I'd make a topic about it. Nurarihyon no Mago: Hyakki Ryouran Taisen is a 4 player fighting game developed by Arc System Works, the talented team behind the hardcore fighting
games Blazblue and Guilty Gear. As would be expected from Arc System Works, this game features a deep fighting system and a level of depth that is sure to please fighting game fans. Not only does this game feature a finely tuned fighting system, Arc System Works was able to achieve this while still staying true to the original manga. The superb attention to detail and the inclusion of more than 100 characters as callable assists will surely be a treat for
diehard fans of the series as well as those who enjoy customization and variety.

I imported the game and I absolutely love it. I recently wrote an FAQ for the Mission Mode that just got accepted to GameFAQs, so you can read some information there too. If you also want to import it but are worried about not being able to navigate through it since it's in Japanese, don't worry because there are resources available to help you and I'm planning on doing more FAQs for it. Below are some links to the official sites and some gameplay videos. If you would like to know anything about it, please feel free to ask, I'd be happy to answer any questions.

The official sites. They have gameplay and general information about the game: