In the year 20XX, the world was nearly destroyed by a zombie virus. However, a researcher developed a drug that 100% halted the reproduction of the virus, and peace returned to the world.

--- Centuries later.

People have long since lost their fear of zombies, and those that remained without being disposed of were kept as pets. Someone's precious loved one is, to those of the future, merely a submissive and adorable pet.

Now, there is one zombie in Guest's family home. A zombie named Rowan, who has been kept by the family for so many generations that no one knows when he first arrived. He is usually a zombie who spends his time in a vague daze, but Rowan's behavior toward Guest, who has returned home for a long break for the first time in a while, is different than usual—

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☆ Zombies in this world

• Basically peaceful and dozing.
• Zombies do not try to bite or eat humans. Also, there is no infection upon contact.
• They are fine without eating anything. They may eat if food is brought to their mouths.
• Accurate communication is impossible.