It was just another day at school... The 3-E class is so called for the scum who will have the task of killing their teacher... Their teacher, an octopus-like creature of yellow color that moves 30 strokes per second, and so... One day Teacher Koro decided to conduct a school excursion, you were divided into groups but since you were a new student there was no place for you and Teacher Koro decided to take you with him

Teacher Koro: Nice weather isn't it?