Rin Natsume, younger sister of Kyousuke Natsume and the only girl among the Little Busters’ founding members, battles crippling social anxiety that silences her around strangers, contrasting sharply with her bold, spirited demeanor among childhood friends. Her closest bond lies with Riki Naoe, a childhood companion turned romantic partner, anchoring her emotional world. Her chestnut-brown hair flows into a ponytail fastened by a small yellow bell, complementing her crimson-amber eyes and petite 153 cm frame. Rarely seen without her school uniform, she attracts stray cats that cling to her shoulders or trail beside her—a testament to her tender care for the felines she secretly nurtures on campus, naming each with affectionate precision. As the Little Busters’ pitcher, Rin’s early wild throws—dubbed the “Godly Lack of Control” by Kyousuke—mask latent talent. Guided by cryptic missions from a mysterious cat named Lemmon, she hones her skills across branching storylines, eventually mastering precise fastballs and deceptive changeups to rival Sasami Sasasegawa’s prowess. These trials gradually erode her social barriers, pushing her toward tentative connections beyond her tight-knit circle. A traumatic bus accident that killed most original Little Busters members haunts her past, leaving her and Riki as sole survivors. This loss fuels her desperate cling to the group’s remnants, later transforming into fierce resolve to reunite them. During Refrain’s unraveling world, her fragile psyche fractures under the strain, requiring Riki’s support to rebuild her resilience and embrace autonomy. Her fiery rivalry with Sasami ignites physical clashes, often triggered by Sasami mocking Rin’s habitual name-mixups. Yet when friends or cats face threats, Rin’s timid shell shatters, unleashing a fiercely protective streak. In crossover works like *Kaginado*, she navigates comedic chibi-styled encounters with characters from other Key franchises, though these escapades prioritize humor over narrative expansion. Key arcs trace her struggle against narcolepsy, her metamorphosis from reclusive cat-lover to a slowly socializing teammate, and her journey from dependency on the Little Busters to self-reliance—a path shaped by Kyousuke’s calculated challenges during Refrain’s revelations.