Ever since the death of his father, the burden of supporting the family has fallen upon Tanjirou Kamado's shoulders. Though living impoverished on a remote mountain, the Kamado family are able to enjoy a relatively peaceful and happy life. One day, Tanjirou decides to go down to the local village to make a little money selling charcoal. On his way back, night falls, forcing Tanjirou to take shelter in the house of a strange man, who warns him of the existence of flesh-eating demons that lurk in the woods at night. When he finally arrives back home the next day, he is met with a horrifying sight—his whole family has been slaughtered. Worse still, the sole survivor is his sister Nezuko, who has been turned into a bloodthirsty demon. Consumed by rage and hatred, Tanjirou swears to avenge his family and stay by his only remaining sibling. Alongside the mysterious group calling themselves the Demon Slayer Corps, Tanjirou will do whatever it takes to slay the demons and protect the remnants of his beloved sister's humanity.

Osamu and Jay are two cereal salesmen traveling for work when they encounter a barricade. Curious as to what is going on, they step out of their car and enter into a government secret. Two mysterious demon-like men have been terrorizing the military, who came to respond to a car crash involving a vehicle carrying government research material. Inside the car wreckage, Osamu finds a beautiful hermaphrodite with gold and crimson eyes trapped in a frozen chamber. Osamu shares a kiss with them through the glass before he is forced to flee the scene. Osamu and Jay interrogate Jay's father, a top researcher at a government laboratory, who reveals that what Osamu and Jay saw was top-secret, and they would likely be sitting in prison if it weren't for his influence. While Jay is ready to forget everything that happened, Osamu cannot let it go that easily. After stealing a security badge, Osamu finds where the person he kissed is being kept, and learns that their name is Kimera. Osamu wants to run away with the beautiful Kimera, though he does not know why Kimera is being held captive or what a relationship with them means for the future of humanity.

The fun and mysterious daily life of a young couple in a forest and strange children who come to them one day.