Kenta Usui is a student who transferred to Karin's high school and also works with her. He is the only human aware of Karin's vampiric nature, having discovered her secret after witnessing her bite three victims, including his own mother. He has promised to keep this knowledge confidential. Since his unhappiness causes Karin's blood to increase rapidly, she has taken it upon herself to cheer him up by preparing a bento for him every day. He could not afford to buy his own lunch, so he is grateful to her.
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