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Kogasa Tatara is a karakasa who wants to surprise people though she hasn't been very successful. In Undefined Fantastic Object she tries to scare the heroine just for fun, yet is beaten easily. Later on, she decides to go to Byakuren's Temple to scare her. Instead Kogasa meets the same person from before and is defeated again.
In Ten Desires she hangs out around the cemetery in hopes of scaring others, but gets interrupted by Yoshika who is guarding it against intrusion. Unable to do it herself, she asks the heroine to defeat Yoshika. Kogasa winds up being defeated by the heroine for being a youkai.