The lack of adult intervention in this series is pushing the limits of my suspension of disbelief.
Whats the timeframe on the last few chapters?
The time frame of this whole volume? (Ch 69 till now) is around 1-2 hourish max. (its more likely that it only happend in around 45 min or less)
This all basically happens
Seo-san is in the room where she is prepared to die, but gets saved by Minazuki.
The classroom explosion was prevented by Teacher, as Komachi is for some reason helping
Seo with covering up the explosion of the classroom.
Seo was also the one who prepared a trap murdering the whole school in the opening ceromony by tying these death
to her survival so the corpes dont appear before her surviving her death.
That gets foiled by Shiina
and by Sayoko (Presidents girl) by
1. Shiina finding the remote control of the explosion
2. Sayoko evacuating the gymasium
Most teachers were in the opening ceremony (they held down Satsuki) so ofc they couldnt see these dangers
Satsuki while had a mental breakdown after finding out that her whole
saving everyone gets to called into action after Seo tries to
outright Mass murder everyone and Kai dying because she saved seo again. Additionally her whole standpoint of saving everyone got asked into question the
whole damn series, where now is the breaking point of that because of Seo, who tries/can to murder more people because she saved.
Because of that she now had enough and now wants to off herself. Satsuki assumes the explosion still happens (because of that one corpes on top and thought it was her own one. Turns out it was Akiras corpse and she decides to rescue her. Seo in turn got goofed and Shiina somehow rerouted the remote to her phone(?)
So yeah, climax of a lot of things which actually happened in only like 45 min. The whole thing didnt had adult intervention is that
1st most teachers were at the opening ceremony
2nd the most loudest thing that happened here was Satsuki crashing through the window, as everything else up to now was only an assumption
3rd prez death was on the other side of the school so nobody really was there too