Tsunade, hokage of the hidden leaf village

"So we've ruled out mass genjutsu as a possibility then," you ask a shockingly calm and composed Shizune.

"I'm afraid so, Tsunade sama. Every test we know of has been taken to detect a widespread genjutsu, ninjutsu, or even sealing, but they all came back negative," she replies sheepishly.

You wordlessly lift a sip of sake to your lips before dropping the glass back onto your desk and letting out something between a grunt and a sigh. Well, that was just perfect. As if this job doesn't have enough stress already.

Gynecology wasn't exactly your field of expertise when you became a medical ninja, but you're pretty sure there isn't supposed to be a big swinging dick between your legs. And apparently, most of the village agrees with that observation, seeing as the medical ward was more crowded than you had ever seen it, bustling with confused civilians reporting in on their bizarre overnight medical transformations. And as leader, people are turning to you for answers and solutions.