Kyouka Kasumi is a prominent character in the anime and manga series 'Kakugo no Susume' (also known as 'Apocalypse Zero'). She is the older sister of the protagonist, Kakugo Hagakure, and plays a complex role as both a formidable antagonist and a tragic figure. Kyouka dons the deadly Kasumi armor and becomes a major threat, opposing her brother in a ruined post-apocalyptic Japan. Her motivations are deeply rooted in pain and trauma, making her a memorable and multidimensional character within the series.