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https://yaharibento.wordpress.com/2016/10/25/oregairu-analysis-truth-behind-hayama-hayato-sacrifice-hikigaya-hachiman-1/yahari-oregariu-zoku-anime-ep4-02-hikigaya-hachiman-hayama-hayato-2/
Hayama Hayato (葉山 隼人) MUST use Hikigaya Hachiman (比企谷 八幡) in the date. (Oregairu Zoku ep4)