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https://yaharibento.wordpress.com/2017/08/27/oregairu-analysis-why-yukinoshita-yukino-stay-angry-hikigaya-hachiman-after-school-trip/
Oregairu Analysis - Why does Yukinoshita Yukino (雪ノ下 雪乃) "Stay Angry" at Hikigaya Hachiman (比企谷 八幡)? (After The School Trip) [Yahari Ore no Seishun Love Come wa Machigatteiru. Season 1 Ep 12 & Zoku Season 2 Ep 3-4]