When feisty college student Yuri is attacked at a party, she's saved by Toshiomi Oya, the underboss of a yakuza syndicate. Despite her obvious attraction to him, she convinces herself that she's not in the market for a bad boy type. But when they meet again, she finds herself irresistibly drawn to him--kicking off a steamy and dangerous love affair that threatens to consume her, body and soul.

Oya and Yuri must overcome one last obstacle if they hope to escape the Shéxiē's underwater lair--Oya's older brother Mao. Just as Oya gains the upper hand, nostalgia for the better days with his estranged brother gets the best of him. Can Oya find it in himself to pull the trigger and end this threat once and for all?