|Occupation(s):||High school student (third-year)|
|Affiliation(s):||Sanada East High|
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Ikushima's senior is a third-year student at Sanada East High. Without meaning to, she sparks a feud between Yanagin's and Habara's seniors in junior school, which ends up lasting for years.
Ikushima's senior is slim, fair-skinned and of average height. She has long dark hair and light-coloured eyes. She is seen wearing East High's uniform, minus the jacket.