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 organised a trip for 2 days and 3 nights at Yomiyama Shrine. After praying at the shrine, Mr. Koga declared everything would be okay and the class is free of the curse. He probabbly hoped that their prays will stop the calamity, but this proved to be wrong. Katsumi stopped the calamity but the teachers believed that their prays stopped it, as in 1998 Mikami-sensei  organised the same trip.

Trivia

 * It is unknown if he is alive or not.