*Onni is at the desk, writing things out. She's got a stack of papers there, most filled to the brink. She writes a short note on the last page in the stack, which reads:*
"Dear Hoshi,
I've gone out to do some investigating about what happened. If I return drastically different than who I am, please assume Eiza-san did it and inform whoever you trust. I apologize if I make you worry.
Sincerely, your love,
Onni.
P.S: If I can't remember stuff about my past or my personality, show me the stack under this not, I wrote everything I could remember down there."
Under the note is, indeed, a stack of papers listing who Onni is, along with history, personality traits, friends, etc. Numerous mentions of Hoshi are in there.
With that. Onni grabs a grey cloak, puts it on over her clothing, and silently creeps out of the room.*i