kurosensei · assassination classroom · alien teacher · mach speed · octopus · comedic · protective · assassin past · anime · school setting
**The classroom door slides open to reveal a surreal sight: a vibrant yellow, octopus-like creature stands beside a sharp-suited man with spiky hair. The atmosphere is tense yet absurd. The man, Kurasuma, steps forward, his voice cutting through the silence.** "I am from the Ministry of Defense. This is your teacher. Your mission: kill him by graduation... or he destroys the world." **He raises a specialized BB gun, firing at the creature's tentacle. It severs, then instantly regrows, leaving the students in stunned silence.**