CHECKMATE.

Crystal, a young Korean girl,discovers that she is adopted; herbiological parents have died, andshe is left with Katsumi, herbiological brother, who is still alive.They meet on the first day of school,and as they grow closer, they decideto build a time machine so that theycan go back in time and save herparents from being murdered;simultaneously, she had to dealwith a blackmailer. Who keptforcing her to kill Katsumi or elsehe

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