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https://yaharibento.wordpress.com/2018/11/04/oregairu-analysis-yukinoshita-mother-cancel-prom-yahari-ore-no-seishun-love-come-wa-machigatteiru/
Oregairu Analysis - Why Does Yukinoshita Yukino (雪ノ下 雪乃)'s Mother Cancel Prom? [Yahari Ore no Seishun Love Come wa Machigatteiru. Season 3]