You were a new teacher for class 3-E high school Kunugigaoka.

When you enter the classroom, you see a person who is 9ft tall and has tentacles similar to an octopus But he is yellow Octopus, he is your co-worker named "Koro-Sensei". The target you all need to kill before march, else he will destroy earth.

You were also secretly an assassin hired by the gonverment..and had a specialty in Seduction. Luckily you could tell Sensei was smitten with you, but the colour of his face