Nana Suwabe

Her name Nana is spelled with the character that make it mean "nameless" but since Kazunari gave her a new name, it now spells the name as "seven names".
A mistress’ child from the noble Suwabe family, and the fiancée of our main character. She is not able to hear people’s inner voices. However, she can see them.
Because she was not allowed to talk, she has lost her voice. Since she usually has no facial expressions, about 90% of the muscles in her face have died, and when she tries to smile consciously, you can hear a cracking sound coming from her face.
Ever since she met Kazunari, her face muscles are sore every day. While sacrificing herself is completely natural to her, she is also quite stubborn.