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Nothing in this manga makes sense.
If the girl bomber knows bully girl bullied her, then GEEE, wouldn't she be focusing ALL her revenge on bully girl and her flunkies?
Also, why the hell would she believe anything bully girl says or claims? Her believing bully girl is dumb, she's dumb, random person who somehow missed a bomb in his pants is dumb, it's all dumb.
Or the bomb investigator boy, his brilliant deduction is EVERYONE's A SUSPECT.
No shit Sherlock, you were a suspect too!!! Oh and apparently the original culprit bomber is a genius Moriarty who can teleport and defy physics and set timers and teleport traps by defying physics.