A beginning to the end (ukyo x heroine story)

'To where my heart and the problem, began. I wonder, when did it really begin... and if we never met, would we both be happy, in the end?' A story before everything leading up to the present. Where Ukyo falls in love and makes a grave choice to save his love from certain death, at the price of his own life. In order to save her from her fate, she crosses into other worlds where she is alive but is dating another guy. World after world, they meet. But. She dies before august 25. Even worse, she has no memories of him. That was the price. The world is trying to rid of her existence. Even he became a threat to her life. So he is on a journey to save her and protect her, from everything. Even himself. A story that tells of his clumsy beginning to his fateful end. Will he save her in time? 'Once a life is saved, another life must be paid. The balance must be apeaced' -Niel.