This Ecchi Anime is the Sequel to To Love-Ru: Trouble - Darkness Series. The dispassionate, transforming assassin Golden Darkness returns to peer deeper into the mysteries surrounding her new life, while the sinister Nemesis manipulates her younger sister Mea from the shadows. Along with their newly discovered mother, Tearju, this previously estranged family quickly becomes the centre of everyone's attention. On the other hand, Princess Momo's Harem Plan stands on shaky ground amidst Rito's inability to confess to his long-time crush Haruna, who has grown feelings of her own.

But things are not as peaceful as they seem: an evil force looms amidst the innocuous commotion, threatening to eclipse the love, happiness, and friendship of Rito and his harem. Only the light of love can hope to banish the shadow.