Natsuki: Anna

Her big break came not through a glamorous audition, but through background work (mob characters) in 2018. For two years, she was the "voice of the crowd"—shouting warnings, gasping at plot twists, and crying in funeral scenes. This grinding period, she later noted, was her true education. "If you can cry on command for a character who doesn't even have a name," she laughed in a 2022 radio interview, "you can do anything." Every seiyuu has a watershed moment. For Anna Natsuki, that moment arrived in 2021 with the psychological drama Echoes of the Glass Sea (Hari no Umi no Kyōmei). She was cast as Yuki Himura , a high school cellist slowly losing her hearing.

Natsuki recorded this scene 18 times. The director, Hiroshi Kanemaru, said, "Anna kept asking for retakes because she felt the 'desperation wasn't raw enough.' On the 19th take, she threw the script down, covered her ears with her hands, and screamed until her voice cracked. We used that take."

This role required Natsuki to perform a brutal vocal arc. In the first three episodes, Yuki speaks in soft, fluid tones. By episode six, as the hearing loss progresses, Yuki’s dialogue becomes fragmented, loud, and uneven. In episode nine, in a scene that went viral on Japanese Twitter, Yuki screams at her mother but cannot hear her own voice.