Komagome-kun wa Nakasetai

Komagome infiltrates a human high school in order to become a full-fledged demon. He's supposed to make his target girl, Shinagawa, despair and drink her tears, but Shinagawa is always smiling and never cries. On the contrary, whenever Komagome sees her smile, his heart starts beating uncontrollably...?! A clumsy, pure demon vs. an oblivious girl, a heart-pounding romantic comedy!

(Source: FaMH Entertainment, translated)