S Senjou no Tena

Kyousuke, a student at a music college, gains the ability to see "notes of life" after an accident. These notes appear around all people. One day, a girl dressed in Gothic Lolita style named Tena approaches him and asks him to become her possession. From that moment, the events of Kyousuke's life begin to shift, though it remains unclear whether these changes will lead to positive or negative outcomes.