Tanaka is the Class Teacher for the Class of Asa Mitaka, Yoshida, the newly introduced character Yuko and other students...
Tanaka conducted an "experiment" where he introduced a Chicken Devil known as Bucky and instructed the students to kill and eat it in 3 months to make them understand how precious life is (later, this "experiment" was a success since students gained affection for Bucky and refused to kill him)
[Tanaka supposedly had an affair with a student who was the [Class President)(https://anilist.co/character/282391/Gakkyuu-Iinchou).]
[Chapter 98 (Bird and War) — Tanaka is killed by [Asa Mitaka)(https://anilist.co/character/282389/Asa-Mitaka) in it's War Devil form.]
