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Kasumi Kirigakure (霧隠 かすみ)Koutarou's older sister. She is slightly violent.
Kotaro always quarrels with her. She is the one who (re)names Toubei as Gon and tries to take care of him. She is also good at badminton.
She is an ace attacker of the badminton club. She has become devildom person by the influence of Yaminorius's magic.