Kodoku no Yurikago

Synopsis en anglais

"That day..." It's been a year since July 22, but the trauma still haunts me. Mio died, Kazuha disappeared. And I was left all alone to continue my dismal existence in a murky, hazy world. But then, out of nowhere, Mio, whom I thought dead, reappeared before me. She introduced herself as a transfer student. Apparently, she wasn't the Mio I knew, just a stranger who looked a great deal like her. Now, tell me, do coincidences like this usually happen?