Miyo Saimori, later known as Miyo Kudou, is the female protagonist of My Happy Marriage. She is the eldest daughter of Shinichi Saimori and Sumi Usuba, born into a once‑powerful noble family known for producing individuals with supernatural abilities known as Gifts. Following the premature death of her biological mother, her father remarried Kanoko Saimori, and Miyo was subjected to years of severe emotional and physical abuse. Her stepmother treated her as a servant, her half‑sister Kaya echoed that cruelty, and her father remained apathetic, openly disregarding her because she appeared to have no supernatural talent. In truth, her mother had sealed Miyo’s powers during childhood to protect her from the dangerous Usuba clan, leaving her unable to manifest even basic abilities.

At the age of nineteen, Miyo is ordered by her father to marry Kiyoka Kudou, a high‑ranking military commander rumored to be cold and cruel. Having no place to return to, she resigns herself to her fate. However, upon arriving at the Kudou household, she discovers that Kiyoka is compassionate, patient, and kind. Under his care and the support of the household staff, especially the maid Yurie, Miyo begins to heal from her deep‑seated trauma. She gradually gains self‑esteem, learns to assert herself, and finds the courage to stand up for her own happiness.

Her personality is initially marked by extreme timidity, docility, and a profound sense of unworthiness. She speaks softly, avoids conflict, and tries to be as unobtrusive as possible. Yet beneath that surface lies a quiet, inner strength: she endures without becoming bitter, remains kind despite years of mistreatment, and slowly develops the resolve to protect those she loves. Her motivations shift from mere survival to a genuine desire to build a happy life with Kiyoka and to understand her own identity and heritage.

Miyo’s role in the story is that of the central character whose journey of self‑discovery drives the narrative. Her arranged marriage becomes the catalyst for change, allowing her to escape her abusive family and uncover the truth about her lineage. Her key relationships include her husband Kiyoka, who becomes her anchor and most trusted ally; her stepmother and half‑sister, who remain antagonistic forces; her biological mother’s family, the Usuba; and her first true friend, a woman named Yurie.

Throughout the series, Miyo undergoes significant character development. She transitions from a passive, nearly broken young woman into someone who can refuse to surrender her engagement even when physically beaten, and who later actively participates in confronting supernatural threats. Her growth is portrayed as a slow, realistic healing process rather than an instant transformation. She learns to accept love, to trust her own judgment, and to embrace the happiness she once believed she did not deserve.

Notably, Miyo possesses a rare and powerful Gift from the Usuba bloodline, known as Dream‑Sight or the Maiden of Dream‑Sight. This ability allows her to enter, perceive, and manipulate the dream world, enabling her to glimpse the past and future, affect the minds of other Gift‑users (as opposed to creatures called Grotesqueries), and even alter events through her dreams. The power initially manifests as terrifying nightmares, but she gradually learns to control it. In her dream‑world encounters, she confronts a shadowy version of her former submissive self, accepting her past suffering and embracing the strength she has gained. Her physical appearance also reflects her journey: years of malnutrition and harsh labor left her thin, with dull hair and callused hands, but under Kiyoka’s care she becomes healthier and her natural beauty emerges, closely resembling her late mother. Her favorite kimono is a pale pink one with cherry blossoms, reminiscent of her mother’s. Kiyoka later gifts her an omamori amulet that not only hides her from tracking spells but also helps her channel her energy to create paper familiars.