According to Jump SQ19 magazine, an OVA of To LOVE-Ru Darkness
was announced to be released on August 17th followed by the recently announced TV series
. The OVA consists of three short episodes featuring Momo, Mikan and Haruna. The three extra episodes of the original manga titled "Prologue", "Pollen Plan" and "Body touch?" will be animated.
To Love-ru Darkness anime official website
Source: Scan of Jump SQ19
To LOVE-Ru Darkness OVA