この中に１人、妹がいる！

能登有沙

as Maiko Kotori (voice)

小山力也

as Kumagoro Mikadono (voice)

久川綾

as Kanoko Mikadono (voice)

櫻井孝宏

as Mikadono Shogo (voice)

日高里菜

as Mei Sagara (voice)

石原夏織

as Konoe Tsuruma (voice)

大亀あすか

as Mana Tendou (voice)

川澄綾子

as Risa Seri (voice)

竹達彩奈

as Rinka Kunitachi (voice)

小倉唯

as Yuzurina Houshou (voice)

Ami Koshimizu

as Ikusu Mizutani (voice)

佐倉綾音

as Miyabi Kannagi (voice)

松永真穂

as Kurumi Kashinoki (voice)