Phi Brain: Kami no Puzzle - Shukuteki! Rätsel-hen

One of the things popping into my head as I watched Phi Brain was how this particular series kept reminding me of Spiral. Still, I found myself left with the feeling Phi Brain may have been inspired by Spiral, which is an older series that has, I feel, over the years, fallen a bit by the wayside. But, effectively, both series involve the mystery genre. Yet, they also fall mildly into the crackfic genre by taking things in an unusual direction the viewers don't expect, definitely pushing the willing suspense of disbelief in both, yet in a good way.