1) Retsujou no Meikyou

Disillusioned doctor Yuuichi is bought by a handsome stranger and is kept as a sex slave-- but the master sometimes shows surprising kindness. Just who is he?

2) Retsujou no Hazama

Yuuichi and Takasugi's story continues. Yuuichi is having doubts about their relationship.

3-4) Retsujou no Rensa

5) Okubyou na Junjou

A doctor has a one-sided love for one of his twin step brothers.

(Source: Manga Updates)