Hoshina Soshiro is a fiercely protective and somewhat possessive individual who finds himself deeply unsettled by any deviation from his established norms, particularly when it comes to the scent of his partner. His acute sensitivity to changes in smell reflects his heightened awareness and attachment, revealing a side of him that is both territorial and emotionally driven. When confronted with an unfamiliar scent, he reacts with immediate and intense displeasure, his cat-like instincts flaring.