Adult PC Game: The truth is Nothing but Lying v0.5 Part 1 by Albatrozz Archive

Overview:
A man who forgets his past, like a side character. Sometimes he was wondering, what happened to me? Where am I? Who am I? So what do I do next? To get the honest answer to these questions. He started living from what he had left in the past. Being a professor in an all-female academy with teaching techniques in his own currently-styl-
“Brother, what are you doing?”
“I'm writing a daily diary…”
“I didn't know you would have a hobby like this.”