To give an overview about what is to be expected when you enter the lessons of Koro Sensei you better not have zoo-phobia or the like because you'll be astonished once the lesson starts. An octopus like creature is too much to handle for anyone who haven't seen too much science fiction lately. This being not enough our octopus is actually the main protagonist around whom everything revolves for the most part. Quite the strange setup you tell yourself - but you know what ? This exact situation where a monster is called the teacher leads into some very amusing events throughout the show. Furthermore the main goal of the students of 'class-e' is to kill their teacher so that they may prevent the earth from total destruction.
Now the title 'Koro Sensei' already refers to the relationship these students of class-e have with their teacher whom they casually are able to call their sensei. On the surface it probably appears like there is some kind of oppression going on coming from that yellow smiling octopus but soon enough the viewer is able to understand that this distinctive smile is nothing but the true and pure outcome of a person as compassionate as this monster called Koro Sensei. To get a better grasp of who he really is one shouldn't forget about his moving speed that is said to be around mach 20 or 6860m/s. Meaning he's able to cover the distance from Germany to USA in about 20 minutes.
Even though there is an overall plot the anime still could be considered episodic but that is based on your own opinion. The main point to consider however is that each episode focuses on one of the characters that are present which leads to a sufficient character development. If you enjoy comedy anime in general then you absolutely will be pleased while watching this especially when it comes to the face expressions of koro sensei which I enjoyed the most. On the other hand the plot doesn't only revolve around class-e but also involves other classes from the same school which are all together opposed to class-e because it's considered as a place where only the 'losers' end up and the mysterious chairman also has a hand in this while the government cooperates together with the children from class-e to achieve their main goal of killing Koro Sensei.
I'll conclude this review by saying that I humbly would recommend this anime to anyone since there is something in this that everyone will find interesting regardless of his own taste. You will have a complete new understanding about the term 'assassination' afterwards and it's even possible to have a new way of understanding to life as a whole after watching this anime because for me it was a refreshing experience and the lighthearted moments combined together with the explanations of what really is important. I was overly certain about not having wasted my time much rather I got the impression that I've 'killed' my free time doing something quite entertaining.
