Consisting of the eponymous mobile game and live streaming, it focuses on the fictional Hasunosora Girls' High School Idol Club.

"[1] The project differs from VTubers in that it has multimedia akin to predecessors that are antithetical to VTubing—wherein those portraying the characters typically remain anonymous—such as real-life live shows and emphasis on the voice actresses.

[2] Project producer Kazuki Satō explained in 2025 that the "original idea" behind it was to "create a comprehensive and enjoyable multimedia mix experience within a single app.

"[3] The in-universe story takes place at Hasunosora Girls' High School in Kanazawa, Ishikawa Prefecture.

[3][5] Live streams in which the characters talk with viewers, called "With×MEETS", are conducted on the app as well as "Fes×LIVE" in-character concerts.

The primary game mode, School Idol Stage, requires players to accumulate as much LOVE points as possible during performances and reach a certain threshold to clear the map; LOVE is attained using a set of 18 cards and their corresponding skills.

series where they are formed mid-story, Hasunosora's School Idol Club was divided into three units since the start of the project.

[5] Styled in all caps as "DOLLCHESTRA" (a portmanteau of "doll" and "orchestra"), the unit focuses on more serious and emotional songs than its counterparts.

[15] For example, the 104th class version of "Identity" is faster than the original rendition and incorporates ska punk themes like brass instruments.

[23] According to Satō, the app was originally planned to be a rhythm game similar to its predecessor Love Live!

He noted this pivot prompted criticism upon release from those who thought it was a generic idol raising game; the Love Live!

Satō called their arrivals "big risks both inside and outside the app" since there were no advance warning or hints, but it was realistic for actual school clubs.

Cerise Bouquet ("Reflection in the mirror") and Dollchestra's ("Sparkly Spot") debut singles were jointly released on April 26, 2023, while Mira-Cra Park's ("Identity") first came on November 29.

Flowers: Hasunosora Girls' School Idol Club,[e] a manga by Tsumumi, began serialization in Ultra Jump on November 17, 2023.

Ten Tanaka, who is involved with writing the story for the game, also wrote the plot for the manga.

[35] Yonkoma comics in the game were compiled into a physical manga titled Link!