Volume 12

Time for the Grim Reaper (『死神』の時間) is the twelfth volume of the Assassination Classroom manga.

Preface
''Ever caught yourself screaming, "I could just kill that teacher"? What would it take to justify such antisocial behavior and weeks of detention? Especially if he's the best teacher you've ever had? Giving you an "F" on a quiz? Mispronouncing your name during roll call...again? How about blowing up the moon and threatening to do the same to Mother Earth—unless you take him out first?! Plus a reward of a cool 100 million from the Ministry of Defense! Okay, now that you're committed... How are you going to pull this off? What does your pathetic class of misfits have in their arsenal to combat Teach's alien technology, bizarre powers and...tentacles?! ''

Publisher's Summary
Mr. Karasuma gives the 3-E students superpowered uniforms…with great results. What amazing feats will they perform in their snazzy new outfits? Then, Mr. Karasuma gives Ms. Vitch a bouquet for her birthday…with disastrous results. Next, a 3-E teacher is kidnapped by master assassin the Grim Reaper, who threatens to kill his hostage if the students tell anyone. Their rescue attempt goes horribly awry, and soon they are the ones in need of rescuing! But at what cost to the world…?