The series revolves around Setsuna Kashiwagi, a Japanese high school student with a chronic heart problem who makes a deal with an Oni for 10 million yen in exchange for his life in a year.

Weak, frail, and constantly bullied, Setsuna believes he is nothing but a burden to his sister and decides to take his own life.

As he prepares to jump off a bridge, a mysterious man appears and presents him with an unusual offer.

Advanced payment or the contestants using any of their share of the Oni Family money during that year is against clan law.

Written by Korean manhwa creator Dall-Young Lim and illustrated by Soo-Hyun Lee, Onihime VS debuted in the special "Hard" issue of Kill Time Communication's male-oriented manga magazine Comic Valkyrie, published on October 29, 2007,[1] and began regular serialization in Comic Valkyrie afterwards.

[7] In South Korea, it is published by Haksan Culture Company under the title of Phantom Princess VS,[8] and was serialized in Booking.