The bride of the protagonist.  She appears to be from a middle-class elven family (who is completely against her marriage to her now husband), and the two live together some distance away from a local human town.  Because she's an elf and a certain portion of her body is half the size of a normal human females, her husband has set on a journey to find a substance that will enable them to copulate sucessfully.

Mixed marriages are a tricky thing, so when the human Kenji and Milfa, an elf, get married, the course of true love does not run smoothly... especially when it turns out that there&rsquo;s a certain difference in plumbing that makes it almost impossible for them to consummate their marriage.
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(Source: Anime News Network)

Birth name: Yumi (由美) Ichihara (市原)

Milfie