At some point in the time before the events of the series, Momo travelled through the galaxy and met tons of plants from different worlds, befriending all of them due to her ability to communicate with them.

Momo, alongside Nana, makes her first appearance in the manga in chapter 97 of To Love Ru, in which the twins arrive on Earth and transport basically the entire cast of the manga into a RPG world inside Trouble Quest, a virtual reality game that Momo and Nana programmed and used to determine whether Rito Yuki is worthy of being engaged to Lala or not.

[7] During Momo and Nana's stay at the Yuki household, they created their own house in the attic using space distortion technology.

They also take care of all their necessities to avoid disturbing Rito's younger sister, Mikan Yuki, for cooking, cleaning, etc.

As of the present time, Momo's Harem Plan is gradually taking effect as Rito, who initially rejected the idea, is slowly beginning to consider it.

Throughout the manga, Momo continuously tries to find ways to make every girl around Rito fall for him as part of the Harem Plan.

[21] Momo also makes a cameo appearance in the third chapter of the manga adaptation of the light novel series Mayoi Neko Overrun!.

[22] The June 2015 issue of Shueisha's Jump Square magazine included the results of its popularity poll for the heroines of To Love-Ru Darkness.

[24] In a review for To Love Ru Darkness, Theron Martin, from Anime News Network, called Momo "conniving" and "calculating", and noted how she effectively becomes the lead female protagonist of the series, which led Lala and Haruna to be relegated to a "mere ensemble supporting status", with both making little more than cameo appearances in many episodes.

She comes on to Rito like an adult seductress, one whose plays are certainly not innocent and whose schemes are designed to promote lustful scenarios both with her and with other girls she sees as potential harem candidates.

Along the way she gradually starts to realize her own feelings towards Rito may go beyond just a play for position, and watching her trying to sort out her actual motivations for forming the harem gives the series a bit more depth than one might expect.

"[25] In another review for Darkness, Martin stated that Momo's ongoing introspection about what she's doing with the Harem Plan has become "less critical", but still "meaty enough" to maintain her role as co-protagonist with Rito.