[Cedille]

Yeah, I also think the two were from AC5 chorus team (and I actually planned to make a separate entry of Tuda). The staff credit of AC5 provides each names of the chorus team in both Japanese and English

本間由喜江 Yukie Homna
浅井美保 Miho Asai
井上倫子 Michiko Inoue
服部知香 Tomoka Hattori
斉藤礼美 Reimi Saito
内山裕美 Hiromi Uchiyama
織田麻美 Asami Oda
山田真知子 Machiko Yamada
新井晶子 Akiko Arai
野原沙織 Saori Nohara
平社淳子 Junko Hirakoso
山下宏樹 Hiroki Yamashita
石侍潔 Kiketsu Seki
津田俊輔 Shunsuke Tsuda
佐々木純 Jun Sasaki
近藤貴路 Takayuki Kondo

The fact both Tuda and Hattori graduated from the same college also corresponds with the inside story about "The Unsung War" posted a few years ago.