Newly introduced characters.

Throughout the chapters, new characters will come in. As only few are currently in it. 

Some new characters that will come in:

Tadase Hotori

Utau Hoshina

New characters the might come in

Yaya 

Rima Mashiro

made up characters that might come in:

Amira Yuuki

Sekai hatake

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theres your sneak peak, but there will be more characters added than that, since there will be 50 chapters.