If you know asssinanation classroom or tbhk then you wouldn't get lost

Scenario 1  (Ac) : It all started when the government wanted to try some kind of machine on the class 3 m to make them more "useful" according to them. They were forced in a way. When they went inside the machine air so that the program would starts work. Something bad happens. They land in another world. (oc) were looking for their comrades. What they didn't know. This is the world where [your turn to die ] cast was. Of course (oc) ends up falling face to face with (Crush). They met for the very first time.

Scenario 2 :Some weird things were happening in the academy Kamome Gakuen. Student phones started doing strange things like making them forget some of the memories. Or make them sense of time. Fourth person was alerted. Hanako, yashiro, kou and (oc).  (oc) and yashiro were both linked to hanako kun. The two needed one another to break the yorishiro. Hanako finds a way to find the responsible appearance of all this. It was to access a kind of machine. But a problem happened. The spirits make sure that the band find themselves stuck in another world [your turn to die ] cast. While (oc) were looking for their friends. They meet (Crush) accidentally