Aritake Deigo has decided to move out because he could not stand living with his family anymore and wants to find a place to live a miserly life of self-loathing. While talking to an apartment agent, he encounters a strange blue haired girl carrying a snake statue. He then starts hearing a voice from the statue and after touching it, he gets knocked out. Upon waking up, he finds out that he has been possessed by Lyssa, the Goddess of Madness. Now, if he can't be happy from the bottom of his heart, he will die.