"Koyou, you're at your limit."
Kouyou is a male beast known as a Lycan with very powerful sex hormones. Jade is the beautiful and macho one being driven crazy by those hormones as they are as strong as the hormones produced by a male cat in heat. Jade helps Kouyou relieve his sexual tension, but only to avoid the trouble that comes with the other males around him being driven insane. He does it as a medical service and only engages in foreplay.

vol.1 contains doujinshi vol.1~4
vol.2 contains doujinshi vol.5~6
vol.3 contains doujinshi vol.7~8

vol.4 contains doujinshi vol.9
  - ROMEO #9.5 (published in Junet magazine)
  - ROMEO BLANKET
  - ROMEO Babies
  - 光陽とジェイド ある日の帰宅後
  - BULE BIRD Epilogue (short stories included in BLUE BIRD)

vol.5 contains doujinshi vol.