Flow

When they were younger, a mysterious enigma was found lurking underneath their house, offering to grant any desire that they presented to it for something equally as valuable in return. But, upon a seriously unsettling event, the twins vowed to each other to never seek its aid again, attempting to conceal it along with the demands of their heart.

It's been 9 years since that day.

Yugi Amane holds a wish that eats away at every part of him; a much more dark , unexpected one...
Despite how it burns him to keep it hidden away, he restrains himself, however, one day a tragic happening even more important to him forces his hand to unbury the enigma.