Regarding the latest chapter nr.23/24, i can confirm the next fact:
*Turning on the serious mode* WTF is wrong with the author, it seems like Zen, Akune and Kikaijima will never appear again while those 3 are actually my favourite characters. It's like the story has become like History's strongest genius where Medaka takes on the
Yomi party of 13. It totally turned into a battle genre and i can't manage to understand what the author is thinking. It was so good in the beginning but that author turned it into a reverse harem and changed genre schoollife into a action packed manga. It doesn't make any sense.