(Check the cover picture of this book for hint)
Go Cheerful Crew ❤️ (Red)
Relationship: Sisters/Best Friends
Oldest to Youngest: Aoi, Makoto
Joyful Girls Squad 🧡 (Orange)
Relationship: Cousins/Best Friends
Oldest to Youngest: Hime, Aguri
Wonder Prime 💛 (Yellow)
Relationship: Best Friends
Oldest to Youngest: Tsubomi, Haruka, Ako
Harmonic Team 💚 (Green)
Relationship: Best Friends
Oldest to Youngest: Komachi, Setsuna, Ichika
Angelic Team 💙 (Blue)
Relationship: Best Friends
Oldest to Youngest: Inori, Saaya
Go Sweetie Crew 💜 (Purple)
Relationship: Best Friends
Oldest to Youngest: Megumi, Towa
Cutie Girls Squad 💗 (Pink)
Relationship: Best Friends
Oldest to Youngest: Kanade, Nodoka, Lala
Wonder Beauty 🤍 (White)
Relationship: Sisters/Best Friends
Oldest to Youngest: Nozomi, Ciel
The Infinity 🖤 (Black)
Relationship: Best Friends
Oldest to Youngest: Hana, Hikari