Ryouya is a total party animal with fuck buddies. Living with Ryouya is Io, a cold and cool type of guy who doesn't show his emotions much, but physically he's the 'perfect fit' with Ryouya. Io doesn't normally feel much in the way of affection, but whenever he smells Ryouya's musk he just goes crazy for it. But Io's never said a word of his true feelings, not even once...