Kyoko Ono

First appearance: Chapter 26
Name revealed: Chapter 77

This flighty, 28-year-old English teacher with a body of a child accompanies Yasunaga on his visit to Ryōzanpaku. She also helps Boris open up to others as he helps her keep the class in control due to most of her students ignoring her. She seems to be rather gullible as she did not seem to care that Kenichi was in "the bathroom" for her entire class. Comically, both Kenichi and Boris believe that she might secretly be that of a Master Class for her ability to sneak up on Boris without him knowing and able to peacefully sleep during the Russian troops attack on the campsite.