great reaction! glad you enjoyed their music! Atarashii Gakko no Leaders translates to "New School Leaders". they've been around for a while, and they do their own choreographies. if you wanna check out more by them, Suki Lie, Giri Giri, and Seishun wo Kirisaku Hado are great songs that i think you might like!
They have such charisma, personality, and, incredible positive energy! I also love the visual of the smallest girl in the group driving that huge Caddy!