Chikyuu Shoujo Arjuna

A near-fatal accident allows Juna Ariyoshi to glimpse a future in which the Earth is dying. A mysterious boy named Chris offers her a chance to live again, but she must accept the power and responsibility of the Avatar of Time.

Fighting the creatures called Raaja forces Juna to perceive connections between human choices and the living world. Her new awareness unsettles even meals and conversations with her boyfriend Tokio, as saving the planet proves more complicated than simply destroying an enemy.