Mayou Inu, Sasou Neko

After hearing all his classmates brag about doing it over the summer, Youta lies and claims he did, too. However, his childhood friend, Wataru, sees right through him. Wataru invites Youta to "study" together so they'd be ready for when they finally scored. But, why do these lessons seem like they're preparing him for a very different type of experience...!?