Just a Reminder:)

It was just a Regular school day for everyone at Kunugigaoka Junior High, until the principle announces for the whole school to evacuate but what if no one told E-Class? Evacuate from what? And why didn't anyone tell E-class about the Announcement.
The End class Get a surprise Visit From the son of the Principal Until they get interrupted. Who interrupted them? Who came visited them? Read to find out.