Clock Zero: Shuuen no Ichibyou is an otome game, developed by Otomate and published by Idea Factory.

Kurou Nadeshiko is the twelve year old daughter of some wealthy high class members. She goes to a wealthy school with her childhood friend and hopes become a doctor one day. However, every night she has a dream about being in another world. That world is full of ruins and she is ten years older. One day, a transfer student named Kaido Takato comes to her class and she gets involved in an after school extra-curricular club which they call “Clock Zero”.