Kokoro Himote, the youngest at 22 of the three Himote sisters, lives in the Himote House share house in Nakano, Tokyo. She shares the house with sisters Tokiyo and Kinami, former classmates Tae and Minamo, and their cat Enishi. Kokoro possesses brown hair cut to ear length and distinctive yellow eyes, with a notably ample chest.

She works at a Nakano government office and identifies as a sharp-tongued realist. Her hobbies include playing otome games, fueled by a hope for true love mirroring their scenarios, and she expresses a fondness for cats. Kokoro is a Yuki-Onna (snow woman), daughter of Mr. Shirayuki and Tsurara Shirayuki, and possesses telepathic abilities like her housemates.

Kokoro actively joins her housemates' daily activities and discussions, often centered on strategies for popularity or appealing to men. She occasionally voices concerns about their living situation, like questioning the wisdom of moving into Himote House during unsettling moments. Her actions and dialogue reveal a protective instinct and self-awareness, prioritizing a precious friend's rescue or acknowledging her limitations against major challenges. Her MBTI type is INTP. She participates in the group's various endeavors, including relationship talks, attempts to connect with potential romantic interests through activities like baseball, and navigating unexpected situations.

Within Himote House, Kokoro maintains familial bonds with Tokiyo and Kinami, friendships with Tae and Minamo, and interacts with Enishi the cat. Her dialogue and actions consistently reflect her integral role in the collective dynamic, shaped by shared experiences and psychic abilities.