Atarashii Gakko! known in Japan as Atarashii Gakkou no Leaders (新しい学校のリーダーズ meaning 'New School Leaders'), is a Japanese girl group formed in 2015.
Suzuka
Kanon
You could check out their discography here or you could listen to a select few of their songs below:
Mizyu
Rin
Interested in Atarashii gakko!?, click here to read more about them.