When I first came to watch this show I was very enticed by its plot and story. A teacher who essentially traps a class in the school and takes them hostage with no way for them to escape. It is a very good idea I would say but the story-telling just falls through.

There are so many plot holes that it hurt to watch. Some are obvious and some are less obvious but watching this show and seeing obviously stupid things happening again and again made it a hard show to watch. My least favorite thing in shows/movies is when the writers do not know how to make the story progress so they write in an obviously bad idea so that the story can progress to that point- this show was abundant.

Lets start with the list of 9 plot holes (rant time, you can stop reading here if you don't want):
1) Right away, the police can get a thermal sniper to see through the windows and shoot the obvious teacher body. Super obvious, but lets just call the police incompetent thats fine. Also I'm using sensei to reference Hiragi Ibuki.

2) Next the class can just simply overpower the teacher together and take his explosive watch. It took the class a long time to do this and when they finally did it he randomly decided to switch his watch to his leg. Why? To make him seem super smart even though this is incredibly stupid. This idea though is probably the biggest plot hole in the entire show, the class had countless opportunities to overpower him and take the watch. They could beat him unconscious, they can grab him arm, its extremely easy to overpower this teacher he is obviously not so strong he is just good at fighting for the most part. But you know, lets say they were just too scared he would blow up the class room in retaliation, ok, but they still committed anyway many times and could easily have overpowered him so many times but that would stop the TV show so they decided to put in plot holes. To fix this plot hole the writers shouldve just had him state that if they were to attack him at all he would blow up the classroom. But instead sensei actually asked them to fight and he put himself in great danger to be knocked unconscious for no reason. Just to have action for the show? Just to put extra suspense in? No clue. I can literally write more paragraphs about all the opportunities the class had to overpower him and solve the show but you get the idea.

3) Next loophole is when the class suddenly decided to side with him. In what world will you hear a sob story about a teacher wanting to protect future students from the same fate? The class literally went from "We hate Reina" to "Reina was an angel lets let sensei trap us in a room where we cant change clothes, sleep or eat comfortably for who knows how long- and with explosives planted above our heads so we can solve one persons mystery. The four people he threatened to blow up suddenly went from being scared-for-their-life-crying, a surely traumatizing event- to wanting to protect and help sensei to achieve his goal of solving a single dead girl's mystery, SERIOUSLY? There is no world this happens, even in a universe with infinite possibilities this would never happen... but why did it happen you ask? Because the writers didn't know how to progress the story otherwise and keep sensei a "good - bad guy"

4) Next they realize that sensei won't use the kids as real hostages so they are about to send in the special agents. But what do you know? One cop decided to go on ahead and put his career at jeopardy- for what? To try and solo arrest him? Ends up fighting him other than having a gun in his pocket and shooting him? You're pretty clear to shoot this terrorist at any point. But I guess the writers didn't know how to progress the story without giving sensei a new hostage, and they literally just decided for this detective to go mental, risk his life and literally hand himself to sensei. At this point I feel like I was about to go mental just seeing these plot holes but I wanted to know the entire point to this show at this stage.

5) Building off the last point, suddenly a super hero shows up to save sensei from imminent defeat... this hero guy just knew this chance meeting would happen and that sensei would lose the fight so he decided to be there to defend him? Come on this show isn't more than a joke at this point. The writers are literally so bad at their jobs they can't think of common sense ways to progress the plot.

6) Then there is the time where he shows himself on the roof and he gets sniped. Why go on the roof? Can't you do it in the classroom? The writers had this idea where they wanted to make sensei look like a genius, so they put in stupid scenes just to do that and have him decide to wear a bulletproof vest. Then he stands back up and laughs to show off his bulletproof vest... did the sniper pack it up and go home? "Alright boys I hit him and he fell down I'll be going home now." Snipers can be very accurate, it was time for a headshot from the same sniper... but I guess that would end the story.

7) This same plothole even leads into the last episode where he reappears on the roof. Im sorry but the cops technically don't give a shit about why he did all this. Their first priority is to kill this terrorist and save the kids. He literally announced he will go to the roof and even told you the time he would go... its time to set up like 10 snipers and tell them all to open fire. But I guess the police just wanted to hear the why.

8) His entire reason for this event was to stop cyber bullying. Yeah cyber bullying is bad and all but is this the best way you came up with to combat that? Tell people you tricked them a couple times and laugh at them? He looked like nothing more than a madman who went crazy. He wanted to portray that he is a crazy lunatic that will blow up the school and he starts yelling at people on a messaging board and laughing at his own joke. Im sorry but you are just a comedy act to everyone already, you have no credibility at all, nothing he says actually means anything.

9) Finally the last scene is that she saves him so that he can live in pain in prison if not given the death penalty for what hes done. Sure the class liked him, but my god blowing up a school and taking a classroom and police officer hostage for 10 days is something that might be punishable by death in Japan.

Now these plot holes are literally off the top of my head, I'm sure I can think of more if given more time, but thats good enough for now.

This entire show is nothing other than an interesting plot written by children. You want to finish it because you want to know the why is he doing this and how did Reina died etc. But the story telling was done horribly leaving the show with countless plot holes and the absolutely worst path from A -> B.

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