Kokoro Harumiya

However, Kokoro herself is uncomfortable with this prominence. She is an "imagist" (a term she uses for herself) who believes that her role is not to be the shining sun, but the quiet moon or the sky that frames the stars. She creates "images" for others to inhabit, preferring to facilitate the shine of her fellow idols—particularly her sister, Madoka, and the unit’s center, Sakuya—rather than bask in the spotlight herself.

and the traditional in Suwa, Nagano, where the concept of Kokoro-hitotsu ("One Heart") is a central cultural theme. Harumiya Shrine and Onbashira The kokoro harumiya

While there is no prominent character named "Kokoro Harumiya" in major anime or manga, it is likely you are referring to Harumiya Tsugumi (春宮 つぐみ) or Shiina Kokomi and the traditional in Suwa, Nagano, where the