Rika Saginuma's a disenchanted teen--dumped by her boyfriend, off the track team due to an injury - who finds her way into a chat room peopled by 4 similarly disgruntled souls. They meet up at school, exhange contact info, and agree to stay in touch... The 4 kids are all beset by problems that seem to overwhelm them...yet are united by a common fascination: blowing up their school on X-Day...
— Description from Comic Vine community (comicvine.gamespot.com).
