Alien space? Time overlap? To hell with that crazy old German man with his whims!
I'm here just for a vacation. And... Remembering the person who died...
…
But I found that it was all true.
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"It was you who shared his fate. She has the same identity, status, ability and... Lifespan as him. They could have fallen in love, and she could have accompanied him throughout his life... But you can't satisfy any of them. You disrupted his life, and you will ruin his nearly perfect life. What you left to him was just a moment of brilliance like fireworks... You, after all, cannot afford such a fate!"