Kuro to Kin no Akanai Kagi.

Kanade Katagiri struggles with severe anxiety, confining her to the safety of her room, where her only companion is her stepbrother, Ikuto Sonomura. However, a pivotal moment arrives when she takes a courageous step outside for a haircut, resulting in a transformation that not only changes her appearance but also ignites a newfound sense of confidence. As she begins to engage with the world around her, she attracts the attention of various suitors, leading to a vibrant social life that she had long avoided.

Amidst this blossoming social circle, Ikuto grapples with feelings of insecurity, fearing that the bonds he shares with Kanade may be at risk. As she navigates her evolving relationships, Kanade must confront her desires and decide who holds the most significance in her life, ultimately exploring the delicate balance between newfound freedom and cherished connections.