Akuma no Himitsu
Ch.1-2: 6 months ago, priest Marlowe took in Raoul, an injured boy with horns and a tail. Despite saying he isn't a demon, Raoul won't stop sexually harassing Marlowe Ch.3: Trainee teacher Hagino hates anything unproductive, including homosexuality. So, when his student Sawatari hits on him, Hagino is nothing but confused and annoyed Ch.4: At graduation, Tomono's best friend Yuba said he'd wait for Tomono's reply until winter. It's now winter, Tomono still hasn't responded Ch.5: Baldur returns to the demon world, after failing to convince his incubus half-brother Raoul to return. There, Baldur is reunited with playboy incubus Zahan, who has been gone for half a century, and Zahan offers to help Baldur
Wasurerarenai Yoru To Hikikaeni