Sora Hikurakawa is a 16-year-old student in Class 1B with multicolored hair, frequently appearing blonde, striking red eyes, and a height of 173 cm. Like his classmate Tomari Hinowa, he was chosen by a non-human entity to become a spouse and is married to Fuwai—a small, pink, dog-like creature—with their union preceding Tomari's marriage to Kanenogi.

Sora demonstrates a naturally caring disposition and excels at supporting others. He actively cultivates himself into what he envisions as an ideal spouse, prioritizing being effortlessly lovable. He aids Tomari’s adjustment to married life with a non-human partner by inviting him into a wives' club, where they exchange insights on their relationships.

In his marriage, Sora displays intensely affectionate behavior, often described as lovey-dovey. This contrasts with Fuwai’s aversion to touch and acute sensitivity about hair loss; the creature reacts strongly if its hat is displaced or its bald spot exposed. Sora’s unreserved acceptance of his marital situation further distinguishes him from Tomari’s initial hesitation.

He maintains close friendships with fellow spouses Tomari Hinowa and Ichiya Mokusaibashi, forming a core dynamic where they navigate their shared experiences.