Yanna Sasatsu presides over her Nagoya high school's photography club. She sports red hair in pigtails, accented by a distinctive lobster-head-shaped hair clip. Her personality blends a moderate affection for her hometown with capricious tendencies. Academically strong in history, she battles significant difficulty waking up early, leading to struggles with morning assemblies.

Yanna exhibits a peculiar habit: sudden sleep overtakes her when overly excited, and she frequently naps within the photography club room. Her hobbies include indulging in solo karaoke sessions. She shares a classroom with Kaito Jin, whom she actively involves in the club. Her mother is identified as Anna Sasatsu.