Suzushiro Watari

Suzushiro Watari is the biological younger sister who shares an inseparable bond with protagonist Naoki. Following the loss of both parents, she relocated alongside her brother to live with their aunt, becoming the very center of Naoki's daily life. She harbors an overwhelming attachment to her brother and meets any woman who approaches him with visible wariness and hostility. Despite being only ten years old and deeply reliant on Naoki, she displays a remarkably mature outlook—going so far as to openly declare that she has no wish to grow up, so that she may remain under her brother's care forever.