Tolong jelaskan mengenai "Mittsu no Namida" dari Manatsu no Sounds Good!

Team A: Misaki Iwasa, Aika Ōta, Shizuka Ōya, Chisato Nakata, Sayaka Nakaya, Ami Maeda, Matsubara Natsumi

Team K: Sayaka Akimoto, Mayumi Uchida, Umeda Ayaka, Ayaka Kikuchi, Tomomi Nakatsuka, Moeno Nitō, Misato Nonaka

Team B: Kana Kobayashi, Mika Komori, Amina Satō, Sumire Satō, Natsuki Satō, Mariya Suzuki, Rina Chikano, Yuka Masuda, Miho Miyazaki

Team 4: Mina Oba, Yūka Tano, Mariko Nakamura, Mariya Nagao

Kenkyūsei:: Rina Izuta, Miyū Ōmori, Natsuki Kojima, Marina Kobayashi, Erena Saeed-Yokota, Yukari Sasaki, Wakana Natori, Rina Hirata, Nana Fujita, Tomu Mutō, Ayaka Morikawa