The girl who loves peacefulness, Yukino. One day she met a mysterious bishoujo, Nobara. Ever since that day, Yukino’s feelings have been on a roller coaster ride! This is the story about the youthful girls who live in the school dormitories.

(Source: Batoto)

The world is plagued with the strange illness, [Voice] that affects teenagers. But when one's feeling is disrupted, a "bunshin" or a clone will appear and it will say everything you truly feel.
However, this illness does not pose any danger to one's life.