It was announced via mangaka Minami Mizuno ’s blog that Nijiiro Days will release an OVA, to be bundled with 13th volume of the manga . According to the May issue of Bessatsu Margaret (pictured), the volume will be released on September 23, 2016.is a manga series by Minami Mizuno that began serialization in January 2012 in Bessatsu Margaret. The second cours of the fifteen-minute anime series is currently airing.Source: Mangaka’s blog Nijiiro Days OVA on MAL