One day when sulking in the bathtub, a mysterious, naked devil-tailed girl appears out of nowhere.
But when Rito angrily declares that marriage is only possible with the person you love, the two dull-witted aliens misunderstand him, believing he truly understands Lala's feelings.
Lala quickly falls in love with him, and Zastin also approves of their engagement, much to Rito's dismay.
A continuation of the manga called To Love-Ru Darkness began serialization in Shueisha's Jump Square magazine on October 4, 2010 and ended on March 4, 2017.
Xebec produced four OVA episodes of To-Love Ru Darkness and later an anime television series adaptation that aired between October and December 2012.
A 26-episode anime series adaptation by Xebec aired in Japan between April and September 2008.