心臓(臓器)の女の子。
きれいな血液を全身へ送り、よごれた血液を回収して肺に送る、人間の命を支える嬢王。肺、筋肉、肝臓、胃、腎臓、あらゆる臓器は彼女の為に働き続ける。元々は赤く美しい姿であったが、突如現れた謎の細胞たちに呪いをかけられてしまい、黒い姿に変わってしまった。この呪いが解かれる日を夢見ながら、世界の幸せを祈り続ける。

A heart girl (the organ).
She sends clean blood to the whole body, collects the dirty blood and sends it to the lungs. She is the queen who supports human life. Her lungs, muscles, liver, stomach, kidneys, and all other organs continue to work for her. Originally red and beautiful, she was cursed by mysterious cells that appeared, and turned black. She continues to pray for the world happiness, dreaming of the day when her curse will be lifted.