Sanae Yamada

As a supporting figure in Boku no Kokoro no Yabai Yatsu, this character plays a vital role within her family unit. She is the devoted wife of Yuki Yamada and shares a deep maternal bond with her daughter, Anna Yamada. Though her presence is secondary to the main protagonists, her relationship with her husband and child provides important context to the domestic lives of the series' central characters.