Tsuchigomori (土籠) is a science teacher at Kamome Academy . He secretly serves as the representative of Mystery Number 5 , the 4 o'clock Library. He is also the current homeroom teacher. While Tsuchigomori seemed perfectly normal, he was considered to be quite a caring and gentle teacher, however, he actually turns out to be a sarcastic and short-tempered person. It can also be seen that he is quite sadistic, taking pleasure in scaring Nene and Kou.