"Himitsu wo Motta Shonentachi" delves into the life of high schooler Mitsuishi Reiya, who three years ago transformed into a nocturnal being, attacking people for blood to save his unrequited love, Yoshino Yuki. Now living in the shadows, Reiya discovers a hidden community of other young men like him, grappling with their nocturnal existence and the urge to hunt.
To escape the violence of night hunting, hide from the public eye, and fight their inherent bloodlust without harming others, these boys gather at a live house. There, they form a passionate band called "404 not found," channeling their harsh experiences and feelings of having nowhere to go into their powerful music. Their songs become a testament to their desire for survival and a peaceful existence. However, their fragile new life is threatened when Reiya becomes the relentless target of Kurose Takumi, the leader of night hunters determined to eradicate all nocturnal beings. The series explores their struggle for identity, belonging, and survival against both their own nature and a dangerous world.
Other names: Boys with Secrets, Himitsu wo Motta Shounentachi