[Mad Pierrot]

Recent chapters have been a turning point for everything in the anime

Spoiler for spoilers:

According to the two doctors from Takahara, Maru has a twin named Yamato whom he has to give a vaccine. While they already found Heaven, they have yet to find Yamato. Also, the rest of the students seem to have been turning into Hirukos. There is also something surprising about a student named Michika. He/she is both genders.