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Kii, a mysterious girl, roams with Ken, a boy who can transform into a key, seeking people whose hearts are locked by emotional struggles. Together, they encounter a diverse cast—a man unable to propose, a student frustrated with her tutor, a BL writer in love with a regular guy—unlocking their hearts to reveal hidden feelings and resolutions. As Kii and Ken navigate their mission, their own bond deepens, blending fantasy, emotion, and human connection in a heartfelt tale of healing, love, and the power of opening up in a world of locked hearts.
