With the author named Ogeretsu Tanaka, I am sure that no one will be disappointed with her mangas.
She wrote a prequel story before this one entitled renai-rubi tadashi furikata and also the known author of the bitch club, escape journey and neon sign amber.... You know this will be good...
This is a story about an uke (kan-chan) who used to abuse his lover before and a co woker shuuna who got interested with kan-chan while their company held a drinking party, and there shuuna discovers the life of kan-chan and faced difficulties in winning him over, his attitude and his commitment to kan-chan....
This is really a manga that I could recommend if you hate dark stories and prefer yaoi with real life touch in it (not exaggerated one)
Hadakeru Kaibutsu