Heart no Diamond
ハートのダイヤ
Himeno experiences chest pain whenever a boy touches her, due to a heart diamond inside her. As a child, she formed a friendship with Mamoru and Keigo, two boys who can touch her without causing her pain. Unaware of the diamond's existence, both vowed to protect her. When individuals attempt to steal Himeno's heart, it falls to Mamoru and Keigo to defend her.
