One day while he's on his way to university, the protagonist Tsukasa meets up with a friend. Actually his friend wanted to test out a potion he made, and had mixed it in Tsukasa's drink. A potion that is supposed to make you "sexy". However, upon testing it out, the potion actually seems to be one that makes him seem "sexy" to men!

Can Tsukasa protect his chastity for the week it takes until the effects wear off?!