Yami ni Tooboe, Mune ni Toge

Norito Ogami, an average student, has a tendency to attract demons. Koma appears before Norito in accordance with the “Sigil Oath,” a promise Norito made in his past life with Koma. The two are attracted to each other, but Koma’s siblings and his beautiful archenemy stand in their way! (Source: SuBLime)