This is just the perfect piece for the perfect moment. You see, on the 30th of April the almighty Walpurgisnacht shall come and instill chaos upon the world. Homura knowing that the only thing that can save her beloved one is to turn back time and she shall then rewind to the turning point of her live, the genesis, the moment, and the suffering. 16th of March is when it all begins, the day Homura starts over the agony.