Clock Zero: Shuuen no Ichibyou Portable

Kurou Nadeshiko is the twelve-year-old daughter of an affluent upper-class family. She attends a posh school with a childhood buddy and aspires to be a doctor one day. Every night, however, she gets a dream of being in another world, and that world is littered with rubble, and she is ten years older. One day, a transfer student named Kaido Takato walks into her class and invites her to join an after-school extracurricular club called “Clock Zero.”