Koi ga Shitai x3 ("Where is Love?" or "I Want to be in Love") is a character driven story that examines the relationships and bonds that six random people thrown together at one moment share with one another, and how that bond develops over the course of the series.

The seven main characters are named after the colors of the rainbow to correspond with the theme song, "Rainbow Connection" by the Carpenters. First, there is Akai Ryosuke (Red, Watabe Atsuro), a high school teacher that is having relationship problems with his fiancee a few days before the wedding; Second, there is Hada Ai (Indigo, Mizuno Miki), a woman who feels like she's drifting aimlessly through the world, latching on to different men so she feels less lonely; Third, there is Nagashima Mikan (Orange, Kanno Miho), a socially awkward hotel worker searching for love; Fourth, there is Shimura Ichiro (Purple, Oikawa Mitsuhiro), an author playboy that holds a secret that prevents him from getting close to others; Fifth, there is Midorikawa Bunpei (Green, Tokoro George), a down-on-his-luck gyuudon (beef-bowl) restaurant manager; Sixth, there is Aoshima Wataru (Blue, Yamada Takayuki), a busy high school student searching for a partner; and lastly, there is Kouda Orie (Yellow, Okae Kumiko), a housewife that is in a loveless marriage.

One fateful day, they all meet at Bunpei's gyuudon-ya and the bonds of fate begin to tighten, as we soon discover all of the characters are related in one way or another. As in the title, each of these characters are searching for love, but will they find it in the end?

Cast
* Watabe Atsuro as Akai Ryosuke
* Mizuno Miki as Haneda Ai
* Kanno Miho as Nagashima Mikan
* Oikawa Mitsuhiro as Shimura Ichiro
* Tokoro George as Midorikawa Bunpei
* Yamada Takayuki as Aoshima Wataru
* Okae Kumiko as Kohda Orie
* Koyuki as Kuroki Reiko
* Inomata Yuki
* Mimura Takayo
* Shimizu Megumi
* Yajima Kenichi