Kinirobachi ni Mitsu

Shuuto Hachioka is an artist who is color blind. One drunken night, he meets a wealthy man named Akifumi Mitsuya. He is drawn to Akifumi, who has a refined appearance and lives in luxury. He also feels an affinity for the mysterious man's unprejudiced demeanor and soft appearance, and agrees to stay at his mansion temporarily. However, as the night wears on, Shuto is enticed by the voices he overhears and ends up witnessing Akifumi's warped proclivities. Thus begins a dangerous, deceptive story between a "pet dog" and his "owner!"

(Source: Renta!)