Clock Zero ~ Shuuen no Ichibyou ~ Devote is an adventure 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”.

[Recommended terminal]
Compatible with Android 4.4 and above.

You may be able to purchase this app on non-compatible OS / non-compatible devices,
It may not work properly.

Use on non-compatible OS / non-compatible terminals
Please note that operation is not guaranteed / refunded.

* We recommend downloading in a Wi-Fi communication environment.
* Saved data cannot be transferred after changing models.

Official site: https://www.otomate.jp/smp/clockzero/