I read a lot of reviews about how they didn't like it cause of the main character changed but personally I thought that was okay. Ive always thought that the most impressive thing about this series was its character development so it kind of made sense how they wanted to make Sakuragi a mentor and stuff. I was also impressed by how each season the feature of the department changed which made each series different from each other. However, I felt that they should have made season 3 a season where Sakuragi was still Yamauchi's mentor because I couldtell that they both had a lot of character development from season 2 (even though Yamauchi was only seen at the end but you could tell he was clumsy) . This way viewers would have gotten attached to Yamauchi and would not mind watching him as the lead. Well thats just my opinion.

Overall it was good as the concept of the department was pretty interesting and unique with the crime prevention and hiding their division's true job. There were quite a few plot twists which made me impressed. Also for all the old fans of the series Sakuragi appears more at the end. Anyway i hope this season will be given a chance!!