Yuya Kusaka, a carefree salaryman, who was enjoying his single life, until a kouhai colleague of him invited him to use "Kikai", an app for love matching. Now he is... He is matched with a gal and a beautiful, innocent girl!
However, these two are actually mononoke's who attack Kusaka (sexually!), they were lured in an app to attack Kusaka (sexually!) and end up living together! But then they meet other mononoke girls on the matching app...!?