The “Abyss” is the last unexplored region, an enormous and treacherous cave system filled with ancient relics and strange creatures. Only the bravest of adventurers can traverse its depths, earning them the nickname, “Cave Raiders.” Within the depths of the Abyss, a girl named Riko stumbles upon a robot who looks like a young boy. Tantalized by the Abyss, Riko and her new friend descend into uncharted territory to unlock its mysteries, but what lies in wait for them in the darkness?

To Love-Ru is a Japanese manga series written by Saki Hasemi, and illustrated by Kentaro Yabuki, creator of Black Cat. The manga was serialized in Shueisha's manga magazine Weekly Sh?nen Jump between April 24, 2006 and August 31, 2009; 18 tank?bon volumes have been published in Japan. A drama CD was released in February 2008 with an original story. A 26-episode anime series adaptation by Xebec aired in Japan between April and September 2008. Six original video animation episodes were produced by Xebec between April 2009 and April 2010. A 12-episode second season by Xebec titled Motto To-Love Ru aired between October and December 2010. A video game was released on the Nintendo DS in August 2008, and another game for the PlayStation Portable was released in October 2008. A continuation of the manga called To Love-Ru Darkness began serialization in Shueisha's Jump Square magazine on October 4, 2010. An anime TV series adaptation for To-Love Ru Darkness produced by Xebec began airing in October 2012. The title, ????, is the English gairaigo "trouble" and "rabu" is the English loan word "love". The title is a pun on the words "love trouble", which describes the harem aspect of the series.