Mr. Koga

Mr. Koga was a homeroom teacher in 1983 for the 9th Grade Class 3.

Appearance
Mr. Koga is an adult man with short black hair and black eyes. He is shown wearing a white shirt with a black tie and gray pants.

History
In 1983, Mr. Koga was the homeroom teacher of Class 3-3. In a last, desperate attempt to break the curse, he organized a trip for two days and three nights at Yomiyama Shrine.

After praying at the shrine, Mr. Koga declared everything would be okay and the curse had been lifted. This was not the case, however, as three more students died on the way down the mountain, before Katsumi stopped the calamity by accidentally killing the extra student. However, as the dead student was immediately forgotten by nearly everyone, it was assumed by Koga and the rest of the faculty that his plan had worked.

Because of this, in 1998 Mikami-sensei organized the same trip, hoping visiting the shrine would fix the curse. Instead, it had much the opposite effect, although they never visited the shrine.