This show is really underrated but it is understandable. First off, the sequel has taken very long. Also, the anime has so many generic tropes that makes it predictable especially in the early episodes. The series is like a mind game series that rests on intelligence and brains throughout the first season. It would have been better only if they did not implement some of the usual high-school clichés we've seen in anime so many times. However, the anime managed to turn things around halfway through. It became brilliant, fast paced and mysterious. The cliffhangers left me anticipating for more and the plot became unpredictable. Its such a pity the sequel never came when the ending of the first season was so impressive.