In the series, Golden Darkness is portrayed as the deadliest assassin in the galaxy who is hired to kill protagonist Rito Yuuki, but instead ends up developing feelings for and falling in love with him.

Having wanted a girl assassin constantly pursuing protagonist Rito Yuuki since the beginning of To Love Ru, its illustrator Kentaro Yabuki finally initiated the addition of Golden Darkness once the characters and world had stabilized.

When Hasemi initially planned to give Golden Darkness a childish way of speaking like Eve, Yabuki asked him to change it and personally added lines that negate the concept of To Love Ru, like "I despise perversion."

[4] Because of the character's Eve connection, Yabuki revealed that he and Hasemi were "more restrained" with the sexual situations in Golden Darkness's debut volume, but said that he can not give her special treatment the next time she appears.

[6] Golden Darkness is introduced in the eponymous 35th chapter of the To Love Ru series, as a dispassionate, withdrawn galactic assassin hired by Lacospo to kill Rito Yuuki.

[7] She is usually found roaming the streets of Sainan, spending most of her time reading books and eating taiyaki; the first food offered to her by Rito.

Her new life is put in jeopardy when Mea Kurosaki, a fellow classmate, is revealed to be her 'little sister' and plans to have Golden Darkness fulfill her contract to kill Rito and return to space as an assassin.

[24][25] Golden Darkness also makes a cameo appearance in the seventh chapter of the manga adaptation of the light novel series Mayoi Neko Overrun!

[30] When English-language website Anime News Network polled its visitors on the same questions, Golden Darkness ranked: 1st as "which character would you want to be your friend?"

[32] Golden Darkness' popularity led to her being featured in various promotional materials and other merchandise for the series, such as 300 official mousepads, each with a 3D image of the character's buttocks, which were distributed in April 2012.

[33] In late January 2016, Shueisha's Shōnen Jump+ online magazine celebrated its one-year anniversary by giving away manga-themed items signed by their respective authors; one such item was a box of tissues containing an image of Golden Darkness saying her iconic catchphrase, "I despise perversion", and as the tissues were removed, they revealed a nude drawing of the character made by Yabuki.