N/A
6 Volumes (Complete)






I found this description at http://www.oocities.org/tokyo/fountain/4000/tenshi.html and thought others might find it helpful, since this series is mentioned in the author's comments at the end of the English version of Breath vol. 1. Yanagi Kohshi from Breath started off as an upperclassman who made a pass at Shingo in Tenshi ka Akuma ka (Shingo also features in Kiss no Yamai)
Tenshi Ka Akuma Ka
by Ochi Chifumi
Despite inclinations toward truancy and general troublemaking, Sasaki Kiichi [nicknamed "Tenshi-sama"] is the darling of the boys' high school he attends... and it's not just his fellow students who appreciate him. However aggravating he may be in class and out of it, this diabolical angel has snuck his way into teacher Nitta Motoharu's heart. The plot, such as it is, follows the comic ups and downs of their romance as they strive to hide their relationship from the rest of the world. If you like your yaoi shameless but cute, this series dishes it out.
(again, this is not my review, just one I found online)