Ano Natsu de Matteru, Sankarea Recommendations
Both Sankarea and Ano Natsu de Matteru are romance genre. The male protagonists falls in love with a girl that isn't human, and many things occurred to try to stop the male and female protagonists together. However, they still try their best to stay together.
This two are very similar in its way of presenting a tasteful romantic comedy. Both shows deal with the main character having romantic feelings for a supernatural being. Also, they similar in the sense that both shows also deal with a love-triangle along with their childhood friends.