The World's Egg - For Those Who Dream

It's another ordinary day in the ordinary lives of Mari and Kotone when something extraordinary happens: the townspeople begin to collapse one after another before their very eyes and transform into horrific monsters! Somehow unaffected by the unknown phenomena, Mari is guided by an ethereal voice and gains the ability to transform into Lilium, a heroine with the power to face the monsters head-on and send them packing. However, saving her home won't be as simple as clobbering her former friends and neighbors... The reality is that the door to another world has opened, and miasma is pouring ou(Storyline via IGDB)