Me2

Plot

From the gifted international artist Sho Murase comes a manga series that will force you to question anything and everything you think you know about reality...

Aki is a shy, introverted teen trying to cope with the death of her older brother. This, coupled with the daily pressures being the most bullied kid in school, lead to her having mysterious blackouts. Entire days begin to be unaccounted for as Aki finds strange items in her closet. Adding to her bewilderment isbthat the cutest boy in school suddenly takes an interest in her. As Aki wonders if her grip on reality is slowly slipping away, something even more shocking might be behind this haunting tale...

-via the back cover.

As a note, this was supposed to have three volumes, but as far as I can tell this never got any further.