Kyoto Seinaru walk around the city with his girlfriend named Tomori. They having their time together until- Seinaru was struck by Tomori after knowing that she doesn't even love him yet mocking him to be so easy to fool. He realize, he got deceived by the one he most believe. He stare to the ground with a blank face while wondering, Why didn't he shed any tears? He finally discover that this is not his first time being put in such a painful situation. Filled with anger, the girl vanished in front of his very eyes. In his little heart, he wondered, If there infinite life for me to go through, Will I finally meet an honest woman, Or will this heart remain empty forever. He finally awake but not to meet with an honest woman he seeking for life- rather being a woman himself. Yet he realize that he is neither a man nor a human anymore. He is now a succubus and have a pointy tail connected to his hips. Amongst the human, demon was considered as an evil race so they united to faced them. He realize it's now even harder for him to find a true love until- a nowhere man greet and treat him gently. Will he finally find his true love, even it's a bit reverse...