Ingaritsu - Inside The Memory

The trigger was an invitation letter I received from my uncle. He was supposed to be an invited guest at the pension ``Mobius'', a lodging facility for young people, but when he saw something he had never seen before, a ``mystery'' began to unfold. "Why don't I remember...?" A ``mystery'' that happens to someone who was supposed to be an invited guest. Please try to solve it by yourself.