Shimako Tōdō arrives at Lillian Girls' Academy bearing a complex heritage. Born to a Buddhist monk father and a mother training to become a Catholic nun, both abandoned their religious paths to marry. Her mother died shortly after her birth, followed by her father succumbing to illness a year later. Raised thereafter by her grandparents and uncle within a Buddhist household, she nonetheless nurtured a childhood aspiration to become a Catholic nun. Her family enrolled her at Lillian as a compromise, where she initially concealed her family's religious background. Physically distinguished by fair skin, long mid-wavy light brown hair, and blue-gray eyes, Shimako is often likened to an "antique western doll." Her personality blends quiet reserve with underlying strength. She excels academically, plays the violin, and participates in the music club. Though introverted and private, she demonstrates thoughtful resolve, such as voicing concerns about Yumi Fukuzawa's feelings during Sachiko Ogasawara's public sœur declaration. Her INFJ personality type reflects empathy, introspection, and a strong sense of duty, while her Enneagram Type 6w5 indicates loyalty, anxiety about uncertainty, and risk aversion. Her development centers on relationships and self-acceptance. As the petite sœur of Sei Satō (Rosa Gigantea), their bond formed during a meeting under cherry blossoms—a recurring symbol. Initially, Shimako viewed the Yamayurikai and school relationships as "shackles," participating only to support Sei. After Sei's graduation, Shimako assumed the role of Rosa Gigantea en bouton but grappled with loneliness and listlessness, frequently retreating to the symbolic cherry tree. Her pivotal growth began upon meeting first-year student Noriko Nijō under the same tree. Noriko discovered Shimako's Buddhist background yet accepted her unconditionally, allowing Shimako to gradually open emotionally. This relationship evolved into a profound connection, culminating in Shimako offering Noriko her rosary during a rainstorm—a gesture symbolizing her transition from seeing the school as a "cage" to a welcoming "nest." Key relationships define her journey. Her dynamic with Sei involved mutual but unspoken understanding; Sei’s departure left a void, though their time together helped Shimako become more sociable. With Noriko, she shifted from protector to equal partner, finding joy in everyday interactions and laughter. She also navigated complex ties with Shizuka Kanina, a rival for Sei’s affection, reflecting a blend of competition and shared admiration. Additional traits include her passion for collecting ginkgo nuts and lily bulbs, a hobby tied to her uncle’s influence, and her gradual embrace of vulnerability, moving from emotional restraint to openly expressing affection and tears. Her journey concludes with a balanced acceptance of her dual religious heritage and an affirmed place within the Lillian community.