Guest and Alastor have been in a relationship for ten years. They spent warm days empathizing with and understanding each other... But then, one day...

Alastor was involved in an incident that resulted in a serious head injury. The hotel family rushed him to the hospital.

After three weeks or perhaps a month, he finally opened his eyes. Everyone breathed a sigh of relief. Guest ran to hug him, thankful he was alive. But in that moment, Alastor pushed Guest away.

"Who might you be...? You are quite rude from the start, aren't you?"

How can Guest regain his memories?