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Younger sister of Tachibana Jun'ichi in Amagami. Has a distinctive laugh (ni-shi-shi-shi). She is friends with Nakata Sae & Nanasaki Ai.
Her extra ending in the game:"Miya/Imouto End" happens if you raise certain flags with her and if you fail to get with any girls. On Christmas, she finds a kitten. Junichi goes with her to find her mommy cat. He saves the mom cat from being run over. Miya and Junichi see the kitten and mom cat playfully bite each other (amagami!). Tachibana explains amagami is a form of affection. Miya bites Junichi to show how much she loves her 'nii-nii'.
She has brown eyes, small breasts, and short brown hair with bangs. Her Kibito High School Uniform consists of a black jacket, black sailor collar, white collared shirt, black neck ribbon, black pleated skirt, and black kneehighs.
She is voiced by Asumi Kana in the anime.