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Trivia

 * He was an underclassman of Subaru's father.
 * He used to love a girl, but it turned out that she was Jin, who was crossdressing.
 * Sora described his color as "Usually hidden somewhere hard to see, but in Rainbow, it was a fun color, shining with seven colors".

Voice Actor Comment
"Among the characters in this work, Kunugi is one of the few teachers. His speech may come across as harsh, and upon the first impression, he appears somewhat dull. At first, it was quite hard for me to portray Kunugi-sensei, who's the polar opposite of me. But as I found out that he actually cares a lot about his students, I ended up having a lot of fun in this role.

Indeed, Kunugi-sensei may be super sadistic, but every now and then, he'd show you his gentleness, too, so please make sure not to miss those rare moments!" (Enstars!)

"" * (Enstars!!)