Ms. Ruiz's Extra Class

Once you get to high school, you choose what electives you want, whether it benefit your future or maybe just something you were required to choose. However, for 10 seniors, they already did their required electives, and didn't know what else to pick. So, as a a final plan, they were put in EC, the extra class. If only they knew what they were getting into to.
P.S. This book is based off of Assassination Classroom, just take out the assassination part, as well as the yellow octopus who can move at Mach 20.