Mika Futsuno, often called Micchan, is a young girl who serves as a shrine maiden at the Tsukuyomi Shrine. She has light green hair and orange eyes, and she is frequently seen in her shrine attire. Her role within the shrine is that of a dedicated priestess, having been associated with the Tsukuyomi family for many years, and she functions somewhat like a caretaker or servant of the temple. She keeps a detailed diary recording the daily events that take place at the shrine.

Personality-wise, Mika is cheerful and approachable, always wearing a smile and maintaining a close connection with those around her. She describes herself as a cheerful mysterious junior character who is always by your side. Despite her warmth, there is a sneaky, mischievous side to her personality, and she has a tendency to dive into events quickly, often dragging others along into adventures. She genuinely enjoys being involved in the happenings around her and can surprise people, especially the protagonist Sasami Tsukuyomi, with her unexpected actions or knowledge.

Mika’s motivations are tied to her duty at the shrine and her curiosity about the mysteries that surround it. She seems to derive satisfaction from participating in the shrine’s important events and from her interactions with the other characters. Her role in the story is that of a supporting figure who becomes increasingly significant as the narrative unfolds. She is involved in mysterious and key shrine-related events, and her true background is revealed more deeply in the third volume of the light novel series, with her also playing a major part in the seventh volume. She plays a key role in uncovering the hidden past of the character Hiruume.

Her relationships are marked by friendliness and loyalty. She is particularly close to Sasami Tsukuyomi, and her interactions with Sasami are often laced with surprise and gentle teasing. She also maintains amicable bonds with the other shrine members and the Yagami sisters. Over the course of the story, Mika undergoes development as the truth about her origin comes to light. Originally, she possessed a powerful ability of her own, but due to a phenomenon known as kami kakushi—a divine concealment—her name, abilities, and even her existence were lost. This loss shapes her background and adds a layer of mystery to her character. Apart from her lost abilities, she does not display overt supernatural powers in the series; instead, her value lies in her knowledge, her diary, and her role as a witness to the shrine’s history.

Mika’s notable traits include her ever-present smile, her ability to slip into events unnoticed, and her keen observation skills that she records in her diary. She acts as a connector between the mundane and the mysterious elements of the story, often serving as a source of information or a catalyst for events. Her cheerful exterior hides a deeper, more enigmatic past, making her a complex and memorable supporting character.