The Poet Of a Math Teacher

What would happen if Kunikida's Notebook is already full? Or when he already rip all of the pages? Do he need to buy a new one or he will no longer able to use his ability?

Kunikida's ability is one of the Agencies seven mysteries, along with his past as a Teacher, Why?

Where did Kunikida teach? or maybe he was still working as a Teacher?

No one knows where school he teach, No one knows how exactly he joined the ADA, [well expect for Ranpo and Fukuzawa], No one knows anything about his past other that he is a Math teacher from somewhere

Of course it results to be one of the mystery in the Agency, and whoever was able to guess it right will win half a million yen

The only rule of the guessing game is that Ranpo can't join the game... because he knows everything