What defines a good sequel?
Everyone has their own opinions, and for me, it's the one that improves on the original season, without straying too far from the original story.

And that's exactly what Assassination Classroom 2 did. So, what exactly should make you give this series a second chance?

To be blunt, I believe that even though S1 was primarily a comedy, toning down the comedic moments was the first step to its success. Comedy shows can be incredibly fun and addicting, but in this show's case in particular, I felt it was the weakest point in the anime, primarily because it can get old at times with how some of the jokes are reused again.

Instead, S2 opted for a more serious, albeit still comedic approach. A lot of the characters, including the main character Nagisa, were given satisfactory backstories that allowed the viewer to be more attached to the characters. This applies the most to Kaede, who I thought was too bland in S1 to be part of the main trio of students. Well, umm... I made a big mistake misjudging her, since she has a pivotal part in the story. Also Karma's here for those that want to simp.

But of course, the spotlight is, once again, on Korosensei, the one-of-a-kind teacher who we finally get to see both his backstory and his motives for teaching class 3-E in the first place. He's the kind of character that you unconciously fall in love with, even if you didn't want to.

The art is the same is before, but the soundtrack greatly fits the moments in the show, including the more somber moments that can make you shed a tear or two.

The new side characters were also a nice addition, notably an orphanage kid who teaches and is taught important life lessons by Nagisa.

But the most important thing is that it has one of the most conclusive endings in anime. A slightly bittersweet, but satisfying ending that allows you to proudly say that your time was not wasted.

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That's not to say that the show is free of faults. Irina can still be as annoying as in S1, and the comedy can still be hit-or-miss.
It also suffers from having way too many characters, so some of them can be overshadowed by others and can get too little screentime and development, which makes most viewers not care about their futures even after the series is over.

But that doesn't detract from an incredible experience that I recommend experiencing.