A detective hunts a serial killer with a bloodthirsty obsession with children's hearts, but he wonders what emotion makes his heart beat the most when he finds himself face to face with the murderer: curiosity, enthrallment, or fear.

"Let's hang out." is the question Mayoi got asked by his friends frequently. To Mayoi, 'no' is not an option. Not because he is a pushover, but because the choice in itself is close to worthless. 'Might as well do it than not' was how he lived his life. A grey-toned every day, from a grey-toned m...