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Annoyed by everything and lacking any interest in love whatsoever, manga artist Rui gets an unexpected visit from a built, scary-looking yakuza. After carelessly becoming the guarantor for her friend's loan, she is told to settle his debt of tens of thousands of dollars... "I'll wait for payment. That is, if you let me have sex with you." And just like that, she's pulled into it. "But, I'm a virgin... Am I gonna be okay?" Just as she thinks she's going to be made to suffer, she gets treated kindly and gently, making her first sensual experience all the more confusing...
When the clock strikes midnight, we're trapped in "After-School." In that world, there's no right answer, no end, no "game clear." There’s only our lifeless bodies, stacking up one by one. One day, Kei Nimori, a young elementary school student, suddenly notices his name scrawled on the classroom blackboard, alongside the mysterious words "After-School Duty." Thus begins a dark, midnight fairy tale of several young boys and girls risking their lives to record and contain monsters in a bizarre realm known as "After-School."