Tolong jelaskan mengenai "Haru no Melody" dari Seifuku no Mannequin

Mikumo Ando, Nene Ito, Marika Ito, Misa Eto, Yukina Kashiwa, Hina Kawago, Mahiro Kawamura, Chiharu Saito, Yuri Saito, Kana Nakada, Kana Nakada, Seira Nagashima, Seira Hatanaka, Hina Higuchi, Seira Miyazawa, Rina Yamato, Maaya Wada