"I don't wanna die here..."

The Sachiko Charm. A charm that is supposed to keep them friends forever, no matter where they are. If only {E}, the president of their class, never found that site. Maybe they would all still be alive.
{A} and {B}, the siblings...
{C} and {G}, the best friends...{D}, the loner...
{E}, the class president...
{F}, their teacher...
{H} and {I}, the close friends...
All of them woke up into a weird school after making the charm, each having no idea where they were. At least, some were lucky. Some woke up with someone they were close to, so they were not completely alone.
But what they didn't know was that, that school couldn't be escaped.
And they were all going to die in it.