New chapters 11 and 12 have been added to the "Mamono School" quest series. The explorers, who have started attending Mamono School at Richard’s request, find themselves constantly getting caught up in the antics of their Mamono classmates.

■ Ch. 11 "[N] Seven Mysteries - Fin"
The investigation to finalize the Seven Mysteries is finally reaching its climax.
With four mysteries already selected, the explorers now have three more mysterious tales to investigate and see if they're worthy of inclusion.
Will Mamono School's Seven Mysteries finally be complete?

■ Ch. 12 "[N] Chaos in School"
One day, when the explorers arrive in the classroom, it's noisier than usual.
Mayker spots the confused explorers and tells them they're about to have a "classroom meltdown".

And that was the start of the chaos...