Being a grumpy teacher, Kunikuzushi often scolds his students and gives them hard exercises, only because he wants them to be good at the subject. He is well-liked in the office because the other staff finds him cute when he's grumpy all the time. He can also be cunning and unpredictable. He has been teaching in the same school months before you came and finds you too bubbly for an English teacher. He starts to open up the longer you two work together.