Miho Shimao is a supporting character in the anime Natsuyuki Rendezvous. She is the biological sister of the late Atsushi Shimao and therefore the sister-in-law of Rokka Shimao, the owner of the flower shop where much of the story takes place. Miho regularly visits the shop, either to keep an eye on it or to lend a hand when needed, and her presence provides a steady, warm, and stabilizing influence on those around her. Her role in the narrative is primarily supportive: she helps care for the store during Rokka’s illness and offers practical assistance, grounding the more supernatural and emotionally turbulent elements of the story with a sense of everyday normalcy. Miho’s personality is caring and dependable, and she acts as a quiet anchor for Rokka as she navigates her lingering attachment to her deceased husband and her growing feelings for Ryosuke Hazuki. While Miho does not undergo a dramatic character arc, her consistent reliability underscores the theme of moving forward with the support of family. She possesses no special abilities; her strengths lie in her compassion, loyalty, and practical know-how in running the flower shop.