Ajisai Sena embodies gentle warmth and quiet resilience, her light-brown hair framing her face with delicate "angel wing bangs" and her warm brown eyes radiating kindness. At 158 cm, her calming smile and pastel accessories soften her presence, reflecting her nurturing role both at home and school. Charged with household duties for her younger brothers amid her parents’ frequent absences, she shoulders responsibility with maturity, though the weight occasionally strains her longing for autonomy. Dubbed the school’s "Angel" for her serene empathy, she effortlessly mediates peer conflicts, yet her saintly facade cracks in private moments—sharp retorts to her brothers or fleeting frustrations reveal her humanity. Her bond with Renako blossoms from steadfast friendship to tender romance: tentative feelings surface in Volume 1, a heartfelt confession unfolds in Volume 3, and by Volume 4, they embrace their relationship openly. A devoted gamer, she finds joy in cozy multiplayer titles, a hobby shared with Renako, and savors strawberry shortcake on her December 12 birthday. Her blood type O mirrors her selfless demeanor, yet her arc subtly traces her struggle to reconcile devotion to others with her own desires. This tension plays out humorously in Volume 5, when a playful sisterly roleplay with Renako spirals into comedic chaos, showcasing their post-confession ease. Through her journey from dutiful sibling to vulnerable partner, Ajisai navigates the quiet turbulence of self-discovery, learning to balance compassion with personal yearning—a testament to growth forged in tenderness and resilience.