The story is very shoujo romance inspired, and centers around the love lives of a group of friends in high school and how they handle their growing feelings as time passes. However, the main focus shifts often.
The first section of the story is centered on the six person group of Yuu, Natsuki, Haruki, Miou, Souta, and Akari. Yuu and Natsuki get together first and remain so for the rest of the series, Souta and Akari can't on the boundary that Akari isn't quite sure what love exactly is, and Haruki and Miou are both in love with each other, but cannot and do not admit it to each other for their entire high school career. Later songs give proper introductions to other potential couples and their relationship woes, who form a secondary group-- Koyuki, a friend of Souta's who changes his appearance in the hopes of winning over Natsuki; Yuu and Natsuki's siblings Hina and Koutarou, who are in a one-sided love triangle because of Hina's affection for Koyuki and Koutarou's crush on Hina; Sena and Midori, a teen model and another student who want to get together but can't approach each other the way they want to; and Ken and Arisa, a playboy and friend of Koutarou and the outspoken girl who didn't initially fall for his charms. The songs would also introduce LIP×LIP, an idol duo who end up the classmates of Hiyori, a student unfamiliar with city life.
Most songs in the series are sung by GUMI and Hatsune Miku and so far, most of the songs on Niconico that had been done with Vocaloids have entered the Hall of Fameand a handful in the Hall of Legend, with most of them having reached over a million views in their YouTube uploads. There are, however, a number of songs in the series (both in-canon and as bonuses) that are sung by various groups and the cast's voice actors that are available on the CD sets and the official accounts.
Aside from the songs, the ~Love Series~ has nine novels released so far that expand on the cast's interactions throughout the songs: "Confession Rehearsal", "A Solution for Jealousy", "First Love Picture Book", "Falling in Love Now.", "Blooming into the Color of Love", "Friday's Good Morning.", "Assertion of the Heart", "Mean Encounter" and "The Day When I Called Your Name".
The series is featured on four of HoneyWorks' albums, but only two of them (Boku Ja Dame Desu Ka? and Nandodatte, Suki.) are officially specific to the series. However, each CD comes with a short comic- Zutto Mae Kara Suki Deshita., with a special edition that included the vomic for "Confession Rehearsal"; Boku Ja Dame Desu Ka?, with a special edition that included the vomic for "A Solution for Jealousy"; Suki ni Naru sono Shunkan wo., with a special edition that includes the vomic for "Falling in Love Now."; and Nandodatte, Suki., which includes a vomic for "Romeo". The vomics serve as a "prologue" to the content of the songs, and also help expand on character interactions and plot threads. Online, the dubbing planning and a digest video for "Confession Rehearsal", the dubbing planning for "A Solution for Jealousy", and the preview for "Romeo" are officially available. "Falling in Love Now."'s video is also available for viewing.
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This song focuses on the new character Koyuki, who previously had short appearances in Embarrassment-Hiding Adolescence and Diagnosis: Lovesickness. He developes a crush on Natsuki and declares Setoguchi his "Rival".
The sequel to Friday's Good Morning, from the perspectives of both Sena and Midori. They exchange phone numbers at first and go on a Sunday get-together to an amusement park, but over the course of weeks they finally begin dating each other in secret.
Aizou and Yuujirou's official introduction. Most of the song appears to be an in-universe music video with Sena as the centerpiece, having Yuujirou and Aizou compete for her. Hiyori also makes a cameo.
A short, PV-less song with Miou and Haruki as teenagers on the cover, indicating the song is about them. The pair spend a night under the stars, until Haruki asks Mio to be by his side. Apparently, he is half-joking at this particular moment in time.
Starting in Spring 2016, the series also had its share of full fledged animated adaptations after getting animated snippets in the vomics. The first of them was "I've Always Liked You" (Zutto Mae Kara Suki Deshita.), adapting Natsuki and Yuu's storyline and "A Solution for Jealousy". The second, "The Moment You Fall in Love" (Suki ni Naru Sono Shunkan wo.), came out in December 2016 and adapts Hina's series of songs.
In 2017, the series was announced to have an animated television special. Titled Itsu Datte Bokura no Koi 10 Centi Datta. (We've Always Been 10 Centimeters Apart.), it centers around Mio and Haruki's arc together and aired for six weeks starting from November 2017.