Rememberance

This is a klangst/Langst, ghost au. Cover by me
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Keith moves to a small town so he could be closer to Shiro, his brother. Normal right? Yes, except for the fact that some days people mourned, and other days, they were completely okay.
The cause of that, he found, was a male named Lance. He was dead. However, every few days he would come back as if he was alive, only to leave once more.
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"It was like this everyday: he was there, and then he wasn't. Everyone saw him, and then everyone seemed to forget him after he left. It was like they were all stuck in some weird magic time loop or something, heck if I knew. But I, I never forgot him. "

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In which Lance is a ghost and everyone forgets him more and more every time he come back, until they suddenly have no memory of him, like he was a stranger, and Keith is determined to never forget him.