In addition to the twelve episodes of the 2007 School Days anime, the School Days: Magical Heart Kokoro-chan original video anime (OVA) spinoff is available streaming.
Video streaming service Viewster added the School Days and Humanity Has Declined anime earlier this month.
Humanity Has Declined (Jinrui wa Suitai Shimashita) premiered in Japan in 2012 and Crunchyroll streamed the series as it aired.
The television series itself is available streaming on Crunchyroll, and Discotek Media released the series on DVD and Blu-ray Disc.