Assassination Classroom is a manga by Yuusei Matsui running on the Weekly Shounen Jump magazine alongside the likes of One Piece, Bleach, and Naruto. It is about an Octopus alien who is now teaching Class 3-E of Kunugigaoka Junior High School. He plans to destroy the Earth after graduation, which is why he is giving his class every day as an opportunity to learn life lessons, as well as a chance to kill him before he destroys the Earth.
In chapter 132 and the past 4 or 5 chapters, it was revealed that one of Koro-sensei’s students, Kayano, actually had the same tentacles as Koro-sensei. Kayano had the tentacles planted in her brain, all to kill her octopus teacher, who killed her sister.
For those who were following the manga, this is a major plot twist that even I was shocked. For one, Kayano had some screentime. While not really one of the more important characters, Kayano always had something to do, either as support or a main support role. What I mean is that, she was always there in the sidelines, but she was there (unlike the others who sometimes get a page or two in one chapter then gone in the next 5). Kayano even had a dumb assassination attempt that was so goofy and ridiculous (she tried killing Koro-sensei by enticing him with a giant Jelly cake. My god).
And so with Kayano having the same powers as Koro Sensei, it is natural for the Octopus anti-hero to be thrown to a corner. No, of course he can kill Kayano probably in one go. However, for those following the series, we know that Koro-sensei generally do not kill anyone, especially his students. Koro-sensei had no choice but to think of a plan to remove the tentacles from Kayano. (For first time dears, take note that another classmate, Itona, had tentacles planted in him before).
The battle between Koro-sensei and Kayano reach its Zenith in this chapter. The tentacles were slowly eating Kayano’s humanity. Koro-sensei device a plan to remove these tentacles. Apparently, it was feeding on Kayano’s hate, so Koro-sensei planned to fake his death to satisfy her urge to kill her. At that moment that she was satisified, he can remove the tentacles while another student can distract her.
Enter Nagisa, one of the main characters and supposed the person with the most killer instinct than the rest. After Kayano “killed” Koro-sensei, the tentacles were satisified. In order for Kayano to forget completely (albeit momentarily) the hate she had, Nagisa proceed to …. kiss her.
What a comic way of ending things. Kayano turned unconscious in Nagisa’s arms. I think this is the first time there was a kissing scene in the manga though.
And while the next chapter might be about some explanations here and there, what’s most important is what Koro-sensei uttered in the final minutes of his battle with Kayano
So perhaps the Octopus was teaching at Class E because of his promise to Kayano’s sister. I like for him to expound more on his back story, as I believed we are reaching the final year of Assassination Classroom’s serialization in Shounen Jump.