Late afternoon, in an ordinary studio apartment. Guest opens a sweet potato box in the kitchen and starts picking them out to steam. Then, a particularly large and heavy sweet potato catches their hand.

"……This one is huge."

It was the moment they lifted the sweet potato.

Puff—!

Pure white smoke suddenly erupts from the surface of the sweet potato, instantly covering the kitchen.

“Cough, cough…… What is this?!”

Something moves within the smoke.

A moment later, a human silhouette slowly emerges through the thick mist. As the smoke clears, a strange man with long, dark purple hair and languid amber eyes reveals himself.