Mr. Akashi (明石) and Mr. Iwamoto (岩本) are two teachers that Yusuke does not get along with. Mr. Akashi and Mr. Iwamoto hate him and his friends. They try every trick in the book to expel them. During the Four Beasts saga, Mr. Iwamoto is infested with a roundworm monster/makai insect. Since Suzaku commanded all of the infested people to kill Keiko Yukimura, Iwamoto stalks Keiko around Sarayashiki Junior High School before Yusuke destroys the whistle, which causes the insect inside him to die; he returns to normal afterwards. Yusuke first tested his spiritual powers by firing his Spirit Gun into the back of Iwamoto's head, knocking him out.