Yui, a college student who tends to get stuck in his own thoughts, is actually an incubus. Incubus have to feed on the vitality of others otherwise, their body will start releasing sexually stimulating pheromones that will attract the opposite sex to them. In Yui's case, his body tends to release an excessive amount when he's hungry and he also can only consume the vitality of his childhood friend, Miki as those of any other person's would give him food poisoning.

There's a rule whereby an incubus will die if they don't have sex before they turn 20 and there's only half a year left before Yui's time limit ends! Both Yui and Miki don't know that they have feelings fir each other and their constant misunderstandings continue to get in the way. Follow this fun yet heartrending, sexy and exciting love comedy!

Note: There are two other couples too in this story.