CLOCK ZERO 終焉の一秒 Devote is an adventure game developed by IDEA FACTORY CO. LTD. It is set in the year 2010, where the protagonist, Kurou Nadeshiko, a sixth-grade student at the prestigious private school, Akirin Gakuen, starts experiencing mysterious dreams of a desolate world covered in a dark and melancholic sky.

One day, Kurou and his childhood friend, Riichirou, are summoned by their new teacher, Asahi Kaga, along with four other students, including rumored troublemakers. The teacher assigns them a "task" to complete, which sets them on a journey filled with challenges and mysteries that gradually seep into their reality.

As the story unfolds, Kurou encounters familiar faces from his dreams, setting in motion a destiny that will change everything.

The initial part of the story is available to play for free, while the full content requires in-app purchases. CLOCK ZERO 終焉の一秒 Devote is compatible with iOS 9.0 and above.