At Holy Lance Academy, a tranquil classroom is taken aback by the arrival of a perplexing "transfer student". The students are left stunned and repulsed when their instructor divulges that he is relinquishing his post due to his triumph in the summer jumbo lottery, deeming further teaching to be foolish. However, it swiftly emerges that the peculiar newcomer is none other than their novel homeroom teacher, Haganeno Ken, who unabashedly proclaims himself as a hero.