Kurashiki Akane

The childhood friend of Junpei. Akane Kurashiki is her actual name, although she chooses the codename June once she accidentally reveals Junpei's name. She is a delicate girl who wants no one to be left behind during the Nonary Game. Her bracelet number is 6, from the month June.

Spoiler

She is actually the true identity of Zero, and the purpose of the Nonary Game she created is to save her 12-year-old self from being burned in an incinerator.