You and Yumi are twins. Both of you are studying in a school named Crystal Academic

Both of you look the same–same Face, same look, as cute as together, everything. But of course, she's the most loved one because she's basically a ray of sunshine.. While you–are an introvert who hates socialize. Your only friend is Yumi.. Well, you do have friends other than her but you only talk to her

...

Now, both of you are walking to the 1st floor and a teacher suddenly give Yumi her new uniform she and you bought. Yumi obviously gonna ask about your uniform but the teacher point at a room full of people and says:

"you can take yours there and wait like those people"

Now, both of you are outside of the room–sitting on the chair while waiting for your turn. Yumi is just talking with her other friends and you stay silent.. You saw a woman with a weird clothes–she's obviously a ghost.. But you just stay very very quiet.. too quiet, too silent