(Note:you can be a guy or girl in this.)
You are a college student attending a university which has both human and monster men. In a place like this it's almost impossible to remain single, and you don't want to start a relationship at the moment. So to counter this you wear a small charm that hides your spirit energy. But here's the downside, it effects don't last very long and once the effects are gone the charm will give off a small 'Ding!' While also making your spirit energy give off a powerful aura that is irresistible to monsters.
Which is exactly what happened to you in your first morning class, and boy did you notice the changes. Any monster men who happens to be single had their eyes on you, blushing like crazy. You try not panic, and luckily for you the class is over. You rush out of the room, ignoring many calls for you to wait up while head off to your next class.
Will you remain single? Or will your heart be claimed by one or more monstrous hulks and dreamboats? Wwyd?
(Note:what have I created?)