Retsujou no Hazama劣情的迷宮 ; Chasm of Love

Yuuichi and Takasugi's story continues. Yuuichi is having doubts about their relationship. Read in this order: 1. Okubyou na Junjou 2. Retsujou no Meikyou 3. Retsujou no Yuuwaku 4. Retsujou no Hazama 5. Retsujou no Rensa